23001311531 has 16 divisors (see below), whose sum is σ = 25379923968. Its totient is φ = 20671123200.

The previous prime is 23001311527. The next prime is 23001311537. The reversal of 23001311531 is 13511310032.

It is a cyclic number.

It is not a de Polignac number, because 23001311531 - 2² = 23001311527 is a prime.

It is a super-2 number, since 2×23001311531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23001311537) 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 in 15 ways as a sum of consecutive naturals, for example, 960206 + ... + 983868.

It is an arithmetic number, because the mean of its divisors is an integer number (1586245248).

Almost surely, 2^23001311531 is an apocalyptic number.

23001311531 is a deficient number, since it is larger than the sum of its proper divisors (2378612437).

23001311531 is a wasteful number, since it uses less digits than its factorization.

23001311531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24682.

The product of its (nonzero) digits is 270, while the sum is 20.

Adding to 23001311531 its reverse (13511310032), we get a palindrome (36512621563).

The spelling of 23001311531 in words is "twenty-three billion, one million, three hundred eleven thousand, five hundred thirty-one".