23131603 has 4 divisors (see below), whose sum is σ = 25234488. Its totient is φ = 21028720.

The previous prime is 23131601. The next prime is 23131609. The reversal of 23131603 is 30613132.

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 23131603 - 2¹ = 23131601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131601) 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, 1051426 + ... + 1051447.

It is an arithmetic number, because the mean of its divisors is an integer number (6308622).

Almost surely, 2^23131603 is an apocalyptic number.

23131603 is a deficient number, since it is larger than the sum of its proper divisors (2102885).

23131603 is a wasteful number, since it uses less digits than its factorization.

23131603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102884.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 23131603 is about 4809.5325136649. The cubic root of 23131603 is about 284.9280745962.

Adding to 23131603 its reverse (30613132), we get a palindrome (53744735).

It can be divided in two parts, 2313 and 1603, that added together give a triangular number (3916 = T₈₈).

The spelling of 23131603 in words is "twenty-three million, one hundred thirty-one thousand, six hundred three".