23142531 has 16 divisors (see below), whose sum is σ = 32428800. Its totient is φ = 14652000.

The previous prime is 23142529. The next prime is 23142541. The reversal of 23142531 is 13524132.

It is not a de Polignac number, because 23142531 - 2¹ = 23142529 is a prime.

It is a super-2 number, since 2×23142531² = 1071153482171922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23142498 and 23142507.

It is not an unprimeable number, because it can be changed into a prime (23142541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9156 + ... + 11406.

It is an arithmetic number, because the mean of its divisors is an integer number (2026800).

Almost surely, 2^23142531 is an apocalyptic number.

23142531 is a deficient number, since it is larger than the sum of its proper divisors (9286269).

23142531 is a wasteful number, since it uses less digits than its factorization.

23142531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426.

The product of its digits is 720, while the sum is 21.

The square root of 23142531 is about 4810.6684566700. The cubic root of 23142531 is about 284.9729367962.

Adding to 23142531 its reverse (13524132), we get a palindrome (36666663).

The spelling of 23142531 in words is "twenty-three million, one hundred forty-two thousand, five hundred thirty-one".