23691131 has 4 divisors (see below), whose sum is σ = 23701152. Its totient is φ = 23681112.

The previous prime is 23691113. The next prime is 23691163. The reversal of 23691131 is 13119632.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23691131 - 2¹⁴ = 23674747 is a prime.

It is a super-2 number, since 2×23691131² = 1122539376118322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23691131.

It is not an unprimeable number, because it can be changed into a prime (23691331) 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, 725 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (5925288).

Almost surely, 2^23691131 is an apocalyptic number.

23691131 is a deficient number, since it is larger than the sum of its proper divisors (10021).

23691131 is an equidigital number, since it uses as much as digits as its factorization.

23691131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10020.

The product of its digits is 972, while the sum is 26.

The square root of 23691131 is about 4867.3535930729. The cubic root of 23691131 is about 287.2071614343.

The spelling of 23691131 in words is "twenty-three million, six hundred ninety-one thousand, one hundred thirty-one".