31145632877 has 2 divisors, whose sum is σ = 31145632878. Its totient is φ = 31145632876.

The previous prime is 31145632829. The next prime is 31145632879. The reversal of 31145632877 is 77823654113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21747105961 + 9398526916 = 147469^2 + 96946^2 .

It is a cyclic number.

It is not a de Polignac number, because 31145632877 - 2²⁰ = 31144584301 is a prime.

Together with 31145632879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31145632879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572816438 + 15572816439.

It is an arithmetic number, because the mean of its divisors is an integer number (15572816439).

Almost surely, 2^31145632877 is an apocalyptic number.

It is an amenable number.

31145632877 is a deficient number, since it is larger than the sum of its proper divisors (1).

31145632877 is an equidigital number, since it uses as much as digits as its factorization.

31145632877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 47.

The spelling of 31145632877 in words is "thirty-one billion, one hundred forty-five million, six hundred thirty-two thousand, eight hundred seventy-seven".