61512631 has 4 divisors (see below), whose sum is σ = 61558000. Its totient is φ = 61467264.

The previous prime is 61512623. The next prime is 61512653. The reversal of 61512631 is 13621516.

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 61512631 - 2³ = 61512623 is a prime.

It is a super-2 number, since 2×61512631² = 7567607545084322, 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 = 61512596 and 61512605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512601) 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, 20586 + ... + 23383.

It is an arithmetic number, because the mean of its divisors is an integer number (15389500).

Almost surely, 2^61512631 is an apocalyptic number.

61512631 is a deficient number, since it is larger than the sum of its proper divisors (45369).

61512631 is a wasteful number, since it uses less digits than its factorization.

61512631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45368.

The product of its digits is 1080, while the sum is 25.

The square root of 61512631 is about 7842.9988524798. The cubic root of 61512631 is about 394.7493597680.

The spelling of 61512631 in words is "sixty-one million, five hundred twelve thousand, six hundred thirty-one".