31638869671 has 2 divisors, whose sum is σ = 31638869672. Its totient is φ = 31638869670.

The previous prime is 31638869657. The next prime is 31638869699. The reversal of 31638869671 is 17696883613.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31638869671 - 2¹⁵ = 31638836903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31638869641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15819434835 + 15819434836.

It is an arithmetic number, because the mean of its divisors is an integer number (15819434836).

Almost surely, 2^31638869671 is an apocalyptic number.

31638869671 is a deficient number, since it is larger than the sum of its proper divisors (1).

31638869671 is an equidigital number, since it uses as much as digits as its factorization.

31638869671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 58.

The spelling of 31638869671 in words is "thirty-one billion, six hundred thirty-eight million, eight hundred sixty-nine thousand, six hundred seventy-one".