231739802381 has 2 divisors, whose sum is σ = 231739802382. Its totient is φ = 231739802380.

The previous prime is 231739802369. The next prime is 231739802431. The reversal of 231739802381 is 183208937132.

231739802381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231304245481 + 435556900 = 480941^2 + 20870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231739802381 is a prime.

It is a super-2 number, since 2×231739802381² (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 (231739802321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115869901190 + 115869901191.

It is an arithmetic number, because the mean of its divisors is an integer number (115869901191).

Almost surely, 2^231739802381 is an apocalyptic number.

It is an amenable number.

231739802381 is a deficient number, since it is larger than the sum of its proper divisors (1).

231739802381 is an equidigital number, since it uses as much as digits as its factorization.

231739802381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 231739802381 in words is "two hundred thirty-one billion, seven hundred thirty-nine million, eight hundred two thousand, three hundred eighty-one".