61712531 has 2 divisors, whose sum is σ = 61712532. Its totient is φ = 61712530.

The previous prime is 61712527. The next prime is 61712569. The reversal of 61712531 is 13521716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61712531 - 2² = 61712527 is a prime.

It is a super-2 number, since 2×61712531² = 7616872964851922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61712531.

It is not a weakly prime, because it can be changed into another prime (61712501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30856265 + 30856266.

It is an arithmetic number, because the mean of its divisors is an integer number (30856266).

Almost surely, 2^61712531 is an apocalyptic number.

61712531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61712531 is an equidigital number, since it uses as much as digits as its factorization.

61712531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 61712531 is about 7855.7323656041. The cubic root of 61712531 is about 395.1765081999.

The spelling of 61712531 in words is "sixty-one million, seven hundred twelve thousand, five hundred thirty-one".