202131312319991 has 2 divisors, whose sum is σ = 202131312319992. Its totient is φ = 202131312319990.

The previous prime is 202131312319943. The next prime is 202131312320009. The reversal of 202131312319991 is 199913213131202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 202131312319991 - 2¹⁴ = 202131312303607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202131312312991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101065656159995 + 101065656159996.

It is an arithmetic number, because the mean of its divisors is an integer number (101065656159996).

Almost surely, 2^{202131312319991} is an apocalyptic number.

202131312319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202131312319991 is an equidigital number, since it uses as much as digits as its factorization.

202131312319991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 202131312319991 in words is "two hundred two trillion, one hundred thirty-one billion, three hundred twelve million, three hundred nineteen thousand, nine hundred ninety-one".