31613718947 has 2 divisors, whose sum is σ = 31613718948. Its totient is φ = 31613718946.

The previous prime is 31613718943. The next prime is 31613718973. The reversal of 31613718947 is 74981731613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31613718947 - 2² = 31613718943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31613718895 and 31613718904.

It is not a weakly prime, because it can be changed into another prime (31613718943) 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 as a sum of consecutive naturals, namely, 15806859473 + 15806859474.

It is an arithmetic number, because the mean of its divisors is an integer number (15806859474).

Almost surely, 2^31613718947 is an apocalyptic number.

31613718947 is a deficient number, since it is larger than the sum of its proper divisors (1).

31613718947 is an equidigital number, since it uses as much as digits as its factorization.

31613718947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The spelling of 31613718947 in words is "thirty-one billion, six hundred thirteen million, seven hundred eighteen thousand, nine hundred forty-seven".