23497981 has 4 divisors (see below), whose sum is σ = 25305532. Its totient is φ = 21690432.

The previous prime is 23497937. The next prime is 23497987. The reversal of 23497981 is 18979432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7022500 + 16475481 = 2650^2 + 4059^2 .

It is a cyclic number.

It is not a de Polignac number, because 23497981 - 2⁷ = 23497853 is a prime.

It is a super-2 number, since 2×23497981² = 1104310222152722, 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 (23497987) 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, 903756 + ... + 903781.

It is an arithmetic number, because the mean of its divisors is an integer number (6326383).

Almost surely, 2^23497981 is an apocalyptic number.

It is an amenable number.

23497981 is a deficient number, since it is larger than the sum of its proper divisors (1807551).

23497981 is a wasteful number, since it uses less digits than its factorization.

23497981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807550.

The product of its digits is 108864, while the sum is 43.

The square root of 23497981 is about 4847.4716089937. The cubic root of 23497981 is about 286.4245126188.

The spelling of 23497981 in words is "twenty-three million, four hundred ninety-seven thousand, nine hundred eighty-one".