31328766857 has 2 divisors, whose sum is σ = 31328766858. Its totient is φ = 31328766856.

The previous prime is 31328766841. The next prime is 31328766893. The reversal of 31328766857 is 75866782313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18112045561 + 13216721296 = 134581^2 + 114964^2 .

It is a cyclic number.

It is not a de Polignac number, because 31328766857 - 2⁴ = 31328766841 is a prime.

It is not a weakly prime, because it can be changed into another prime (31328766817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15664383428 + 15664383429.

It is an arithmetic number, because the mean of its divisors is an integer number (15664383429).

Almost surely, 2^31328766857 is an apocalyptic number.

It is an amenable number.

31328766857 is a deficient number, since it is larger than the sum of its proper divisors (1).

31328766857 is an equidigital number, since it uses as much as digits as its factorization.

31328766857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 56.

The spelling of 31328766857 in words is "thirty-one billion, three hundred twenty-eight million, seven hundred sixty-six thousand, eight hundred fifty-seven".