231257182780391 has 2 divisors, whose sum is σ = 231257182780392. Its totient is φ = 231257182780390.

The previous prime is 231257182780339. The next prime is 231257182780489. The reversal of 231257182780391 is 193087281752132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231257182780391 - 2¹⁰ = 231257182779367 is a prime.

It is a super-2 number, since 2×231257182780391² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231257182780391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231257182780291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115628591390195 + 115628591390196.

It is an arithmetic number, because the mean of its divisors is an integer number (115628591390196).

Almost surely, 2^{231257182780391} is an apocalyptic number.

231257182780391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231257182780391 is an equidigital number, since it uses as much as digits as its factorization.

231257182780391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 231257182780391 in words is "two hundred thirty-one trillion, two hundred fifty-seven billion, one hundred eighty-two million, seven hundred eighty thousand, three hundred ninety-one".