23131311 has 16 divisors (see below), whose sum is σ = 35457024. Its totient is φ = 13139424.

The previous prime is 23131289. The next prime is 23131333. The reversal of 23131311 is 11313132.

It is an interprime number because it is at equal distance from previous prime (23131289) and next prime (23131333).

It is not a de Polignac number, because 23131311 - 2¹⁰ = 23130287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131351) 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, 450 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (2216064).

Almost surely, 2^23131311 is an apocalyptic number.

23131311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23131311 is a deficient number, since it is larger than the sum of its proper divisors (12325713).

23131311 is a wasteful number, since it uses less digits than its factorization.

23131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550.

The product of its digits is 54, while the sum is 15.

The square root of 23131311 is about 4809.5021571884. The cubic root of 23131311 is about 284.9268756687.

Adding to 23131311 its reverse (11313132), we get a palindrome (34444443).

It can be divided in two parts, 2313131 and 1, that added together give a palindrome (2313132).

The spelling of 23131311 in words is "twenty-three million, one hundred thirty-one thousand, three hundred eleven".