61212733931 has 2 divisors, whose sum is σ = 61212733932. Its totient is φ = 61212733930.

The previous prime is 61212733913. The next prime is 61212733963. The reversal of 61212733931 is 13933721216.

Together with previous prime (61212733913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61212733931 is a prime.

It is a super-2 number, since 2×61212733931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61212735931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606366965 + 30606366966.

It is an arithmetic number, because the mean of its divisors is an integer number (30606366966).

Almost surely, 2^61212733931 is an apocalyptic number.

61212733931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212733931 is an equidigital number, since it uses as much as digits as its factorization.

61212733931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The spelling of 61212733931 in words is "sixty-one billion, two hundred twelve million, seven hundred thirty-three thousand, nine hundred thirty-one".