61406181 has 10 divisors (see below), whose sum is σ = 91730342. Its totient is φ = 40937400.

The previous prime is 61406179. The next prime is 61406203. The reversal of 61406181 is 18160416.

61406181 is a `hidden beast` number, since 6 + 1 + 40 + 618 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32148900 + 29257281 = 5670^2 + 5409^2 .

It is not a de Polignac number, because 61406181 - 2¹ = 61406179 is a prime.

It is a super-2 number, since 2×61406181² = 7541438130009522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61406101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 378970 + ... + 379131.

Almost surely, 2^61406181 is an apocalyptic number.

It is an amenable number.

61406181 is a deficient number, since it is larger than the sum of its proper divisors (30324161).

61406181 is an equidigital number, since it uses as much as digits as its factorization.

61406181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758113 (or 758104 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 61406181 is about 7836.2096066912. The cubic root of 61406181 is about 394.5215185822.

Adding to 61406181 its reverse (18160416), we get a palindrome (79566597).

It can be divided in two parts, 6140 and 6181, that added together give a palindrome (12321).

The spelling of 61406181 in words is "sixty-one million, four hundred six thousand, one hundred eighty-one".