61212735931 has 2 divisors, whose sum is σ = 61212735932. Its totient is φ = 61212735930.

The previous prime is 61212735887. The next prime is 61212735937. The reversal of 61212735931 is 13953721216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61212735931 - 2¹⁵ = 61212703163 is a prime.

It is a super-2 number, since 2×61212735931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61212735937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606367965 + 30606367966.

It is an arithmetic number, because the mean of its divisors is an integer number (30606367966).

Almost surely, 2^61212735931 is an apocalyptic number.

61212735931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212735931 is an equidigital number, since it uses as much as digits as its factorization.

61212735931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The spelling of 61212735931 in words is "sixty-one billion, two hundred twelve million, seven hundred thirty-five thousand, nine hundred thirty-one".