23281137 has 24 divisors (see below), whose sum is σ = 38619360. Its totient is φ = 13366080.

The previous prime is 23281133. The next prime is 23281147. The reversal of 23281137 is 73118232.

It is not a de Polignac number, because 23281137 - 2² = 23281133 is a prime.

It is a super-2 number, since 2×23281137² = 1084022680025538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23281137.

It is not an unprimeable number, because it can be changed into a prime (23281133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4308 + ... + 8069.

It is an arithmetic number, because the mean of its divisors is an integer number (1609140).

Almost surely, 2^23281137 is an apocalyptic number.

It is an amenable number.

23281137 is a deficient number, since it is larger than the sum of its proper divisors (15338223).

23281137 is a wasteful number, since it uses less digits than its factorization.

23281137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12413 (or 12410 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 23281137 is about 4825.0530567031. The cubic root of 23281137 is about 285.5407278193.

Adding to 23281137 its reverse (73118232), we get a palindrome (96399369).

The spelling of 23281137 in words is "twenty-three million, two hundred eighty-one thousand, one hundred thirty-seven".