23534981 has 4 divisors (see below), whose sum is σ = 23857452. Its totient is φ = 23212512.

The previous prime is 23534947. The next prime is 23534993. The reversal of 23534981 is 18943532.

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 6806881 + 16728100 = 2609^2 + 4090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23534981 is a prime.

It is a super-2 number, since 2×23534981² = 1107790661340722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23534941) 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, 161126 + ... + 161271.

It is an arithmetic number, because the mean of its divisors is an integer number (5964363).

Almost surely, 2^23534981 is an apocalyptic number.

It is an amenable number.

23534981 is a deficient number, since it is larger than the sum of its proper divisors (322471).

23534981 is an equidigital number, since it uses as much as digits as its factorization.

23534981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322470.

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

The square root of 23534981 is about 4851.2865303958. The cubic root of 23534981 is about 286.5747687824.

The spelling of 23534981 in words is "twenty-three million, five hundred thirty-four thousand, nine hundred eighty-one".