23185381 has 4 divisors (see below), whose sum is σ = 23195052. Its totient is φ = 23175712.

The previous prime is 23185373. The next prime is 23185411. The reversal of 23185381 is 18358132.

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 can be written as a sum of positive squares in 2 ways, for example, as 11282881 + 11902500 = 3359^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 23185381 - 2³ = 23185373 is a prime.

It is a super-2 number, since 2×23185381² = 1075123784230322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23185321) 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, 1761 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (5798763).

Almost surely, 2^23185381 is an apocalyptic number.

It is an amenable number.

23185381 is a deficient number, since it is larger than the sum of its proper divisors (9671).

23185381 is an equidigital number, since it uses as much as digits as its factorization.

23185381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9670.

The product of its digits is 5760, while the sum is 31.

The square root of 23185381 is about 4815.1200400405. The cubic root of 23185381 is about 285.1487107356.

The spelling of 23185381 in words is "twenty-three million, one hundred eighty-five thousand, three hundred eighty-one".