631772937223387 has 2 divisors, whose sum is σ = 631772937223388. Its totient is φ = 631772937223386.

The previous prime is 631772937223333. The next prime is 631772937223403. The reversal of 631772937223387 is 783322739277136.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631772937223387 is a prime.

It is not a weakly prime, because it can be changed into another prime (631772937253387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315886468611693 + 315886468611694.

It is an arithmetic number, because the mean of its divisors is an integer number (315886468611694).

Almost surely, 2^{631772937223387} is an apocalyptic number.

631772937223387 is a deficient number, since it is larger than the sum of its proper divisors (1).

631772937223387 is an equidigital number, since it uses as much as digits as its factorization.

631772937223387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672126336, while the sum is 70.

The spelling of 631772937223387 in words is "six hundred thirty-one trillion, seven hundred seventy-two billion, nine hundred thirty-seven million, two hundred twenty-three thousand, three hundred eighty-seven".