61810181 has 8 divisors (see below), whose sum is σ = 65646360. Its totient is φ = 57996288.

The previous prime is 61810163. The next prime is 61810219. The reversal of 61810181 is 18101816.

61810181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9247681 + 52562500 = 3041^2 + 7250^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61810181 is a prime.

It is a super-2 number, since 2×61810181² = 7640996950505522, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61810181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61810481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (8205795).

Almost surely, 2^61810181 is an apocalyptic number.

It is an amenable number.

61810181 is a deficient number, since it is larger than the sum of its proper divisors (3836179).

61810181 is a wasteful number, since it uses less digits than its factorization.

61810181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 61810181 is about 7861.9451155551. The cubic root of 61810181 is about 395.3848324504.

Adding to 61810181 its reverse (18101816), we get a palindrome (79911997).

The spelling of 61810181 in words is "sixty-one million, eight hundred ten thousand, one hundred eighty-one".