131111891597 has 2 divisors, whose sum is σ = 131111891598. Its totient is φ = 131111891596.

The previous prime is 131111891593. The next prime is 131111891611. The reversal of 131111891597 is 795198111131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129264697156 + 1847194441 = 359534^2 + 42979^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111891597 - 2² = 131111891593 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131111891593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65555945798 + 65555945799.

It is an arithmetic number, because the mean of its divisors is an integer number (65555945799).

Almost surely, 2^131111891597 is an apocalyptic number.

It is an amenable number.

131111891597 is a deficient number, since it is larger than the sum of its proper divisors (1).

131111891597 is an equidigital number, since it uses as much as digits as its factorization.

131111891597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 47.

The spelling of 131111891597 in words is "one hundred thirty-one billion, one hundred eleven million, eight hundred ninety-one thousand, five hundred ninety-seven".