23161331 has 2 divisors, whose sum is σ = 23161332. Its totient is φ = 23161330.

The previous prime is 23161319. The next prime is 23161337. The reversal of 23161331 is 13316132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23161331 - 2⁶ = 23161267 is a prime.

It is a super-2 number, since 2×23161331² = 1072894507383122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23161337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11580665 + 11580666.

It is an arithmetic number, because the mean of its divisors is an integer number (11580666).

Almost surely, 2^23161331 is an apocalyptic number.

23161331 is a deficient number, since it is larger than the sum of its proper divisors (1).

23161331 is an equidigital number, since it uses as much as digits as its factorization.

23161331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 23161331 is about 4812.6220504004. The cubic root of 23161331 is about 285.0500825087.

Adding to 23161331 its reverse (13316132), we get a palindrome (36477463).

The spelling of 23161331 in words is "twenty-three million, one hundred sixty-one thousand, three hundred thirty-one".