23131242 has 12 divisors (see below), whose sum is σ = 50117730. Its totient is φ = 7710408.

The previous prime is 23131231. The next prime is 23131249. The reversal of 23131242 is 24213132.

It can be written as a sum of positive squares in only one way, i.e., 23126481 + 4761 = 4809^2 + 69^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1285069 = 23131242 / (2 + 3 + 1 + 3 + 1 + 2 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (23131249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642517 + ... + 642552.

Almost surely, 2^23131242 is an apocalyptic number.

23131242 is an abundant number, since it is smaller than the sum of its proper divisors (26986488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23131242 is a wasteful number, since it uses less digits than its factorization.

23131242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285077 (or 1285074 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 23131242 is about 4809.4949838834. The cubic root of 23131242 is about 284.9265923590.

Adding to 23131242 its reverse (24213132), we get a palindrome (47344374).

The spelling of 23131242 in words is "twenty-three million, one hundred thirty-one thousand, two hundred forty-two".