23231531551 has 4 divisors (see below), whose sum is σ = 23401104912. Its totient is φ = 23061958192.

The previous prime is 23231531537. The next prime is 23231531563. The reversal of 23231531551 is 15513513232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23231531551 - 2³¹ = 21084047903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23231531581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84786475 + ... + 84786748.

It is an arithmetic number, because the mean of its divisors is an integer number (5850276228).

Almost surely, 2^23231531551 is an apocalyptic number.

23231531551 is a deficient number, since it is larger than the sum of its proper divisors (169573361).

23231531551 is a wasteful number, since it uses less digits than its factorization.

23231531551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169573360.

The product of its digits is 13500, while the sum is 31.

The spelling of 23231531551 in words is "twenty-three billion, two hundred thirty-one million, five hundred thirty-one thousand, five hundred fifty-one".