23542991 has 4 divisors (see below), whose sum is σ = 23562312. Its totient is φ = 23523672.

The previous prime is 23542969. The next prime is 23542993. The reversal of 23542991 is 19924532.

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 23542991 - 2¹⁸ = 23280847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23542993) 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, 7700 + ... + 10313.

It is an arithmetic number, because the mean of its divisors is an integer number (5890578).

Almost surely, 2^23542991 is an apocalyptic number.

23542991 is a deficient number, since it is larger than the sum of its proper divisors (19321).

23542991 is a wasteful number, since it uses less digits than its factorization.

23542991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19320.

The product of its digits is 19440, while the sum is 35.

The square root of 23542991 is about 4852.1120143706. The cubic root of 23542991 is about 286.6072764714.

The spelling of 23542991 in words is "twenty-three million, five hundred forty-two thousand, nine hundred ninety-one".