23138643331 has 2 divisors, whose sum is σ = 23138643332. Its totient is φ = 23138643330.

The previous prime is 23138643329. The next prime is 23138643361. The reversal of 23138643331 is 13334683132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23138643331 - 2¹ = 23138643329 is a prime.

It is a super-2 number, since 2×23138643331² (a number of 22 digits) contains 22 as substring.

Together with 23138643329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23138643361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569321665 + 11569321666.

It is an arithmetic number, because the mean of its divisors is an integer number (11569321666).

Almost surely, 2^23138643331 is an apocalyptic number.

23138643331 is a deficient number, since it is larger than the sum of its proper divisors (1).

23138643331 is an equidigital number, since it uses as much as digits as its factorization.

23138643331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 37.

The spelling of 23138643331 in words is "twenty-three billion, one hundred thirty-eight million, six hundred forty-three thousand, three hundred thirty-one".