61979559931 has 2 divisors, whose sum is σ = 61979559932. Its totient is φ = 61979559930.

The previous prime is 61979559911. The next prime is 61979559947. The reversal of 61979559931 is 13995597916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61979559931 - 2¹¹ = 61979557883 is a prime.

It is a super-2 number, since 2×61979559931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61979559911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989779965 + 30989779966.

It is an arithmetic number, because the mean of its divisors is an integer number (30989779966).

Almost surely, 2^61979559931 is an apocalyptic number.

61979559931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61979559931 is an equidigital number, since it uses as much as digits as its factorization.

61979559931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20667150, while the sum is 64.

The spelling of 61979559931 in words is "sixty-one billion, nine hundred seventy-nine million, five hundred fifty-nine thousand, nine hundred thirty-one".