31230320057 has 2 divisors, whose sum is σ = 31230320058. Its totient is φ = 31230320056.

The previous prime is 31230320047. The next prime is 31230320131. The reversal of 31230320057 is 75002303213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23153882896 + 8076437161 = 152164^2 + 89869^2 .

It is a cyclic number.

It is not a de Polignac number, because 31230320057 - 2²⁰ = 31229271481 is a prime.

It is a super-3 number, since 3×31230320057³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31230320047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615160028 + 15615160029.

It is an arithmetic number, because the mean of its divisors is an integer number (15615160029).

Almost surely, 2^31230320057 is an apocalyptic number.

It is an amenable number.

31230320057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230320057 is an equidigital number, since it uses as much as digits as its factorization.

31230320057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 26.

The spelling of 31230320057 in words is "thirty-one billion, two hundred thirty million, three hundred twenty thousand, fifty-seven".