31515551051 has 2 divisors, whose sum is σ = 31515551052. Its totient is φ = 31515551050.

The previous prime is 31515551029. The next prime is 31515551063. The reversal of 31515551051 is 15015551513.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31515551051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31515550999 and 31515551017.

It is not a weakly prime, because it can be changed into another prime (31515554051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15757775525 + 15757775526.

It is an arithmetic number, because the mean of its divisors is an integer number (15757775526).

Almost surely, 2^31515551051 is an apocalyptic number.

31515551051 is a deficient number, since it is larger than the sum of its proper divisors (1).

31515551051 is an equidigital number, since it uses as much as digits as its factorization.

31515551051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9375, while the sum is 32.

The spelling of 31515551051 in words is "thirty-one billion, five hundred fifteen million, five hundred fifty-one thousand, fifty-one".