31319655097 has 2 divisors, whose sum is σ = 31319655098. Its totient is φ = 31319655096.

The previous prime is 31319655091. The next prime is 31319655131. The reversal of 31319655097 is 79055691313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20044613241 + 11275041856 = 141579^2 + 106184^2 .

It is a cyclic number.

It is not a de Polignac number, because 31319655097 - 2⁷ = 31319654969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31319655097.

It is not a weakly prime, because it can be changed into another prime (31319655091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15659827548 + 15659827549.

It is an arithmetic number, because the mean of its divisors is an integer number (15659827549).

Almost surely, 2^31319655097 is an apocalyptic number.

It is an amenable number.

31319655097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31319655097 is an equidigital number, since it uses as much as digits as its factorization.

31319655097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 765450, while the sum is 49.

The spelling of 31319655097 in words is "thirty-one billion, three hundred nineteen million, six hundred fifty-five thousand, ninety-seven".