23351972539 has 4 divisors (see below), whose sum is σ = 26687968624. Its totient is φ = 20015976456.

The previous prime is 23351972521. The next prime is 23351972543. The reversal of 23351972539 is 93527915332.

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

It is not a de Polignac number, because 23351972539 - 2⁵ = 23351972507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23351972492 and 23351972501.

It is not an unprimeable number, because it can be changed into a prime (23351972509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667998032 + ... + 1667998045.

It is an arithmetic number, because the mean of its divisors is an integer number (6671992156).

Almost surely, 2^23351972539 is an apocalyptic number.

23351972539 is a deficient number, since it is larger than the sum of its proper divisors (3335996085).

23351972539 is an equidigital number, since it uses as much as digits as its factorization.

23351972539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335996084.

The product of its digits is 1530900, while the sum is 49.

The spelling of 23351972539 in words is "twenty-three billion, three hundred fifty-one million, nine hundred seventy-two thousand, five hundred thirty-nine".