31631447387 has 2 divisors, whose sum is σ = 31631447388. Its totient is φ = 31631447386.

The previous prime is 31631447231. The next prime is 31631447389. The reversal of 31631447387 is 78374413613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31631447387 - 2²⁶ = 31564338523 is a prime.

Together with 31631447389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31631447389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15815723693 + 15815723694.

It is an arithmetic number, because the mean of its divisors is an integer number (15815723694).

Almost surely, 2^31631447387 is an apocalyptic number.

31631447387 is a deficient number, since it is larger than the sum of its proper divisors (1).

31631447387 is an equidigital number, since it uses as much as digits as its factorization.

31631447387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 47.

The spelling of 31631447387 in words is "thirty-one billion, six hundred thirty-one million, four hundred forty-seven thousand, three hundred eighty-seven".