231011623513 has 16 divisors (see below), whose sum is σ = 265680809856. Its totient is φ = 198808727040.

The previous prime is 231011623499. The next prime is 231011623517. The reversal of 231011623513 is 315326110132.

It is a happy number.

It is not a de Polignac number, because 231011623513 - 2²¹ = 231009526361 is a prime.

It is a super-2 number, since 2×231011623513² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231011623517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4682106 + ... + 4731187.

It is an arithmetic number, because the mean of its divisors is an integer number (16605050616).

Almost surely, 2^231011623513 is an apocalyptic number.

231011623513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231011623513 is a deficient number, since it is larger than the sum of its proper divisors (34669186343).

231011623513 is a wasteful number, since it uses less digits than its factorization.

231011623513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9413424.

The product of its (nonzero) digits is 3240, while the sum is 28.

Adding to 231011623513 its reverse (315326110132), we get a palindrome (546337733645).

The spelling of 231011623513 in words is "two hundred thirty-one billion, eleven million, six hundred twenty-three thousand, five hundred thirteen".