23200991 has 8 divisors (see below), whose sum is σ = 25380864. Its totient is φ = 21032920.

The previous prime is 23200987. The next prime is 23200993. The reversal of 23200991 is 19900232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23200991 - 2² = 23200987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23200991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23200993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 6966.

It is an arithmetic number, because the mean of its divisors is an integer number (3172608).

Almost surely, 2^23200991 is an apocalyptic number.

23200991 is a deficient number, since it is larger than the sum of its proper divisors (2179873).

23200991 is a wasteful number, since it uses less digits than its factorization.

23200991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5901.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 23200991 is about 4816.7407030065. The cubic root of 23200991 is about 285.2126903154.

The spelling of 23200991 in words is "twenty-three million, two hundred thousand, nine hundred ninety-one".