22540991 has 8 divisors (see below), whose sum is σ = 24902400. Its totient is φ = 20231640.

The previous prime is 22540981. The next prime is 22540993. The reversal of 22540991 is 19904522.

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

It is not a de Polignac number, because 22540991 - 2¹⁰ = 22539967 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 (22540993) 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, 12101 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (3112800).

Almost surely, 2^22540991 is an apocalyptic number.

22540991 is a deficient number, since it is larger than the sum of its proper divisors (2361409).

22540991 is a wasteful number, since it uses less digits than its factorization.

22540991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26029.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 22540991 is about 4747.7353548824. The cubic root of 22540991 is about 282.4821446934.

The spelling of 22540991 in words is "twenty-two million, five hundred forty thousand, nine hundred ninety-one".