61351581 has 8 divisors (see below), whose sum is σ = 83345760. Its totient is φ = 40129232.

The previous prime is 61351571. The next prime is 61351601. The reversal of 61351581 is 18515316.

61351581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 61351581 - 2¹⁹ = 60827293 is a prime.

It is a super-2 number, since 2×61351581² = 7528032982399122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351531) 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, 192771 + ... + 193088.

It is an arithmetic number, because the mean of its divisors is an integer number (10418220).

Almost surely, 2^61351581 is an apocalyptic number.

It is an amenable number.

61351581 is a deficient number, since it is larger than the sum of its proper divisors (21994179).

61351581 is a wasteful number, since it uses less digits than its factorization.

61351581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385915.

The product of its digits is 3600, while the sum is 30.

The square root of 61351581 is about 7832.7250047477. The cubic root of 61351581 is about 394.4045528188.

Adding to 61351581 its reverse (18515316), we get a palindrome (79866897).

The spelling of 61351581 in words is "sixty-one million, three hundred fifty-one thousand, five hundred eighty-one".