23031161 has 4 divisors (see below), whose sum is σ = 23089572. Its totient is φ = 22972752.

The previous prime is 23031157. The next prime is 23031163. The reversal of 23031161 is 16113032.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18490000 + 4541161 = 4300^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 23031161 - 2² = 23031157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23031163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28610 + ... + 29403.

It is an arithmetic number, because the mean of its divisors is an integer number (5772393).

Almost surely, 2^23031161 is an apocalyptic number.

It is an amenable number.

23031161 is a deficient number, since it is larger than the sum of its proper divisors (58411).

23031161 is an equidigital number, since it uses as much as digits as its factorization.

23031161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58410.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 23031161 is about 4799.0791825099. The cubic root of 23031161 is about 284.5150715337.

Adding to 23031161 its reverse (16113032), we get a palindrome (39144193).

The spelling of 23031161 in words is "twenty-three million, thirty-one thousand, one hundred sixty-one".