23216312161 has 9 divisors (see below), whose sum is σ = 27007971249. Its totient is φ = 19898781924.

The previous prime is 23216312159. The next prime is 23216312179. The reversal of 23216312161 is 16121361232.

The square root of 23216312161 is 152369.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 23216312161 - 2¹ = 23216312159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23216312261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1055700 + ... + 1077466.

Almost surely, 2^23216312161 is an apocalyptic number.

23216312161 is the 152369-th square number.

23216312161 is the 76185-th centered octagonal number.

It is an amenable number.

23216312161 is a deficient number, since it is larger than the sum of its proper divisors (3791659088).

23216312161 is an frugal number, since it uses more digits than its factorization.

23216312161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43548 (or 21774 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

Adding to 23216312161 its reverse (16121361232), we get a palindrome (39337673393).

The spelling of 23216312161 in words is "twenty-three billion, two hundred sixteen million, three hundred twelve thousand, one hundred sixty-one".