61256631 has 16 divisors (see below), whose sum is σ = 82583424. Its totient is φ = 40387104.

The previous prime is 61256617. The next prime is 61256641. The reversal of 61256631 is 13665216.

It is not a de Polignac number, because 61256631 - 2²¹ = 59159479 is a prime.

It is a super-2 number, since 2×61256631² = 7504749682940322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61256641) 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 15 ways as a sum of consecutive naturals, for example, 199380 + ... + 199686.

It is an arithmetic number, because the mean of its divisors is an integer number (5161464).

Almost surely, 2^61256631 is an apocalyptic number.

61256631 is a deficient number, since it is larger than the sum of its proper divisors (21326793).

61256631 is a wasteful number, since it uses less digits than its factorization.

61256631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its digits is 6480, while the sum is 30.

The square root of 61256631 is about 7826.6615488342. The cubic root of 61256631 is about 394.2009826890.

The spelling of 61256631 in words is "sixty-one million, two hundred fifty-six thousand, six hundred thirty-one".