23137281 has 6 divisors (see below), whose sum is σ = 33420530. Its totient is φ = 15424848.

The previous prime is 23137271. The next prime is 23137297. The reversal of 23137281 is 18273132.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 10112400 = 3609^2 + 3180^2 .

It is not a de Polignac number, because 23137281 - 2⁶ = 23137217 is a prime.

It is a super-2 number, since 2×23137281² = 1070667544145922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23137201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1285396 + ... + 1285413.

Almost surely, 2^23137281 is an apocalyptic number.

It is an amenable number.

23137281 is a deficient number, since it is larger than the sum of its proper divisors (10283249).

23137281 is a wasteful number, since it uses less digits than its factorization.

23137281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570815 (or 2570812 counting only the distinct ones).

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

The square root of 23137281 is about 4810.1227635061. The cubic root of 23137281 is about 284.9513859833.

The spelling of 23137281 in words is "twenty-three million, one hundred thirty-seven thousand, two hundred eighty-one".