23453981 has 4 divisors (see below), whose sum is σ = 23594592. Its totient is φ = 23313372.

The previous prime is 23453971. The next prime is 23454001. The reversal of 23453981 is 18935432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23453981 is a prime.

It is a super-2 number, since 2×23453981² = 1100178449496722, 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 (23453971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70055 + ... + 70388.

It is an arithmetic number, because the mean of its divisors is an integer number (5898648).

Almost surely, 2^23453981 is an apocalyptic number.

It is an amenable number.

23453981 is a deficient number, since it is larger than the sum of its proper divisors (140611).

23453981 is a wasteful number, since it uses less digits than its factorization.

23453981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140610.

The product of its digits is 25920, while the sum is 35.

The square root of 23453981 is about 4842.9310339917. The cubic root of 23453981 is about 286.2456241584.

The spelling of 23453981 in words is "twenty-three million, four hundred fifty-three thousand, nine hundred eighty-one".