23031431 has 4 divisors (see below), whose sum is σ = 23098152. Its totient is φ = 22964712.

The previous prime is 23031409. The next prime is 23031461. The reversal of 23031431 is 13413032.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23031431 - 2⁶ = 23031367 is a prime.

It is a super-2 number, since 2×23031431² = 1060893627815522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23031461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32840 + ... + 33533.

It is an arithmetic number, because the mean of its divisors is an integer number (5774538).

Almost surely, 2^23031431 is an apocalyptic number.

23031431 is a deficient number, since it is larger than the sum of its proper divisors (66721).

23031431 is an equidigital number, since it uses as much as digits as its factorization.

23031431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66720.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 23031431 is about 4799.1073128239. The cubic root of 23031431 is about 284.5161833429.

Adding to 23031431 its reverse (13413032), we get a palindrome (36444463).

The spelling of 23031431 in words is "twenty-three million, thirty-one thousand, four hundred thirty-one".