23011531 has 2 divisors, whose sum is σ = 23011532. Its totient is φ = 23011530.

The previous prime is 23011519. The next prime is 23011543. The reversal of 23011531 is 13511032.

It is a balanced prime because it is at equal distance from previous prime (23011519) and next prime (23011543).

It is a cyclic number.

It is not a de Polignac number, because 23011531 - 2¹³ = 23003339 is a prime.

It is a super-2 number, since 2×23011531² = 1059061117927922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23011561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11505765 + 11505766.

It is an arithmetic number, because the mean of its divisors is an integer number (11505766).

Almost surely, 2^23011531 is an apocalyptic number.

23011531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23011531 is an equidigital number, since it uses as much as digits as its factorization.

23011531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 23011531 is about 4797.0335625259. The cubic root of 23011531 is about 284.4342155960.

Adding to 23011531 its reverse (13511032), we get a palindrome (36522563).

The spelling of 23011531 in words is "twenty-three million, eleven thousand, five hundred thirty-one".