23515137 has 8 divisors (see below), whose sum is σ = 34837280. Its totient is φ = 15676740.

The previous prime is 23515117. The next prime is 23515147. The reversal of 23515137 is 73151532.

It is not a de Polignac number, because 23515137 - 2¹⁴ = 23498753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 870931 = 23515137 / (2 + 3 + 5 + 1 + 5 + 1 + 3 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23515137.

It is not an unprimeable number, because it can be changed into a prime (23515117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435439 + ... + 435492.

It is an arithmetic number, because the mean of its divisors is an integer number (4354660).

Almost surely, 2^23515137 is an apocalyptic number.

23515137 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

23515137 is a deficient number, since it is larger than the sum of its proper divisors (11322143).

23515137 is an equidigital number, since it uses as much as digits as its factorization.

23515137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870940 (or 870934 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 23515137 is about 4849.2408684247. The cubic root of 23515137 is about 286.4942023442.

Adding to 23515137 its reverse (73151532), we get a palindrome (96666669).

The spelling of 23515137 in words is "twenty-three million, five hundred fifteen thousand, one hundred thirty-seven".