31663925387 has 2 divisors, whose sum is σ = 31663925388. Its totient is φ = 31663925386.

The previous prime is 31663925341. The next prime is 31663925411. The reversal of 31663925387 is 78352936613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31663925387 - 2¹⁴ = 31663909003 is a prime.

It is not a weakly prime, because it can be changed into another prime (31663925317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831962693 + 15831962694.

It is an arithmetic number, because the mean of its divisors is an integer number (15831962694).

Almost surely, 2^31663925387 is an apocalyptic number.

31663925387 is a deficient number, since it is larger than the sum of its proper divisors (1).

31663925387 is an equidigital number, since it uses as much as digits as its factorization.

31663925387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The spelling of 31663925387 in words is "thirty-one billion, six hundred sixty-three million, nine hundred twenty-five thousand, three hundred eighty-seven".