23409531 has 12 divisors (see below), whose sum is σ = 34143408. Its totient is φ = 15454224.

The previous prime is 23409523. The next prime is 23409541. The reversal of 23409531 is 13590432.

It is not a de Polignac number, because 23409531 - 2³ = 23409523 is a prime.

It is a super-2 number, since 2×23409531² = 1096012283279922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 23409495 and 23409504.

It is not an unprimeable number, because it can be changed into a prime (23409511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11700 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (2845284).

Almost surely, 2^23409531 is an apocalyptic number.

23409531 is a deficient number, since it is larger than the sum of its proper divisors (10733877).

23409531 is a wasteful number, since it uses less digits than its factorization.

23409531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25362 (or 25359 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 23409531 is about 4838.3396945647. The cubic root of 23409531 is about 286.0646788368.

Adding to 23409531 its reverse (13590432), we get a palindrome (36999963).

The spelling of 23409531 in words is "twenty-three million, four hundred nine thousand, five hundred thirty-one".