61365631 has 4 divisors (see below), whose sum is σ = 64975392. Its totient is φ = 57755872.

The previous prime is 61365607. The next prime is 61365641. The reversal of 61365631 is 13656316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61365631 - 2⁵ = 61365599 is a prime.

It is a super-2 number, since 2×61365631² = 7531481336056322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61365593 and 61365602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61365641) 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 3 ways as a sum of consecutive naturals, for example, 1804855 + ... + 1804888.

It is an arithmetic number, because the mean of its divisors is an integer number (16243848).

Almost surely, 2^61365631 is an apocalyptic number.

61365631 is a deficient number, since it is larger than the sum of its proper divisors (3609761).

61365631 is a wasteful number, since it uses less digits than its factorization.

61365631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609760.

The product of its digits is 9720, while the sum is 31.

The square root of 61365631 is about 7833.6218315668. The cubic root of 61365631 is about 394.4346577806.

The spelling of 61365631 in words is "sixty-one million, three hundred sixty-five thousand, six hundred thirty-one".