231877791391 has 2 divisors, whose sum is σ = 231877791392. Its totient is φ = 231877791390.

The previous prime is 231877791347. The next prime is 231877791401. The reversal of 231877791391 is 193197778132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231877791391 - 2¹¹ = 231877789343 is a prime.

It is a super-2 number, since 2×231877791391² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231877791091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115938895695 + 115938895696.

It is an arithmetic number, because the mean of its divisors is an integer number (115938895696).

Almost surely, 2^231877791391 is an apocalyptic number.

231877791391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231877791391 is an equidigital number, since it uses as much as digits as its factorization.

231877791391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 58.

The spelling of 231877791391 in words is "two hundred thirty-one billion, eight hundred seventy-seven million, seven hundred ninety-one thousand, three hundred ninety-one".