23531531511 has 16 divisors (see below), whose sum is σ = 31485284064. Its totient is φ = 15632784384.

The previous prime is 23531531489. The next prime is 23531531537. The reversal of 23531531511 is 11513513532.

It is not a de Polignac number, because 23531531511 - 2¹⁰ = 23531530487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531531581) 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, 2317201 + ... + 2327333.

It is an arithmetic number, because the mean of its divisors is an integer number (1967830254).

Almost surely, 2^23531531511 is an apocalyptic number.

23531531511 is a deficient number, since it is larger than the sum of its proper divisors (7953752553).

23531531511 is a wasteful number, since it uses less digits than its factorization.

23531531511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12770.

The product of its digits is 6750, while the sum is 30.

The spelling of 23531531511 in words is "twenty-three billion, five hundred thirty-one million, five hundred thirty-one thousand, five hundred eleven".