61988392631 has 16 divisors (see below), whose sum is σ = 69519857568. Its totient is φ = 54775958400.

The previous prime is 61988392621. The next prime is 61988392633. The reversal of 61988392631 is 13629388916.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61988392631 is a prime.

It is a super-2 number, since 2×61988392631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61988392633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340961 + ... + 490133.

It is an arithmetic number, because the mean of its divisors is an integer number (4344991098).

Almost surely, 2^61988392631 is an apocalyptic number.

61988392631 is a deficient number, since it is larger than the sum of its proper divisors (7531464937).

61988392631 is a wasteful number, since it uses less digits than its factorization.

61988392631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150242.

The product of its digits is 3359232, while the sum is 56.

The spelling of 61988392631 in words is "sixty-one billion, nine hundred eighty-eight million, three hundred ninety-two thousand, six hundred thirty-one".