31311129870877 has 2 divisors, whose sum is σ = 31311129870878. Its totient is φ = 31311129870876.

The previous prime is 31311129870751. The next prime is 31311129870883. The reversal of 31311129870877 is 77807892111313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27169176308836 + 4141953562041 = 5212406^2 + 2035179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311129870877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311129870077) 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, 15655564935438 + 15655564935439.

It is an arithmetic number, because the mean of its divisors is an integer number (15655564935439).

Almost surely, 2^{31311129870877} is an apocalyptic number.

It is an amenable number.

31311129870877 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311129870877 is an equidigital number, since it uses as much as digits as its factorization.

31311129870877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 58.

The spelling of 31311129870877 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-nine million, eight hundred seventy thousand, eight hundred seventy-seven".