22756991 has 4 divisors (see below), whose sum is σ = 23077584. Its totient is φ = 22436400.

The previous prime is 22756963. The next prime is 22757011. The reversal of 22756991 is 19965722.

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 22756991 - 2¹⁸ = 22494847 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 (22756901) 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, 160190 + ... + 160331.

It is an arithmetic number, because the mean of its divisors is an integer number (5769396).

Almost surely, 2^22756991 is an apocalyptic number.

22756991 is a deficient number, since it is larger than the sum of its proper divisors (320593).

22756991 is an equidigital number, since it uses as much as digits as its factorization.

22756991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320592.

The product of its digits is 68040, while the sum is 41.

The square root of 22756991 is about 4770.4288067217. The cubic root of 22756991 is about 283.3815768677.

The spelling of 22756991 in words is "twenty-two million, seven hundred fifty-six thousand, nine hundred ninety-one".