23216731 has 4 divisors (see below), whose sum is σ = 23710752. Its totient is φ = 22722712.

The previous prime is 23216717. The next prime is 23216741. The reversal of 23216731 is 13761232.

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 23216731 - 2¹⁷ = 23085659 is a prime.

It is a super-2 number, since 2×23216731² = 1078033196652722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23216696 and 23216705.

It is not an unprimeable number, because it can be changed into a prime (23216741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246940 + ... + 247033.

It is an arithmetic number, because the mean of its divisors is an integer number (5927688).

Almost surely, 2^23216731 is an apocalyptic number.

23216731 is a deficient number, since it is larger than the sum of its proper divisors (494021).

23216731 is an equidigital number, since it uses as much as digits as its factorization.

23216731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494020.

The product of its digits is 1512, while the sum is 25.

The square root of 23216731 is about 4818.3743109061. The cubic root of 23216731 is about 285.2771736663.

Adding to 23216731 its reverse (13761232), we get a palindrome (36977963).

It can be divided in two parts, 2321 and 6731, that multiplied together give a palindrome (15622651).

The spelling of 23216731 in words is "twenty-three million, two hundred sixteen thousand, seven hundred thirty-one".