23129531 has 2 divisors, whose sum is σ = 23129532. Its totient is φ = 23129530.

The previous prime is 23129521. The next prime is 23129549. The reversal of 23129531 is 13592132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23129531 - 2¹⁰ = 23128507 is a prime.

It is a super-2 number, since 2×23129531² = 1069950408559922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23129531.

It is not a weakly prime, because it can be changed into another prime (23129521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11564765 + 11564766.

It is an arithmetic number, because the mean of its divisors is an integer number (11564766).

Almost surely, 2^23129531 is an apocalyptic number.

23129531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23129531 is an equidigital number, since it uses as much as digits as its factorization.

23129531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 23129531 is about 4809.3171032902. The cubic root of 23129531 is about 284.9195669195.

The spelling of 23129531 in words is "twenty-three million, one hundred twenty-nine thousand, five hundred thirty-one".