22157791 has 4 divisors (see below), whose sum is σ = 22206112. Its totient is φ = 22109472.

The previous prime is 22157789. The next prime is 22157797. The reversal of 22157791 is 19775122.

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 22157791 - 2¹ = 22157789 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 (22157797) 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, 23466 + ... + 24391.

It is an arithmetic number, because the mean of its divisors is an integer number (5551528).

Almost surely, 2^22157791 is an apocalyptic number.

22157791 is a deficient number, since it is larger than the sum of its proper divisors (48321).

22157791 is an equidigital number, since it uses as much as digits as its factorization.

22157791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48320.

The product of its digits is 8820, while the sum is 34.

The square root of 22157791 is about 4707.2062839863. The cubic root of 22157791 is about 280.8722417501.

The spelling of 22157791 in words is "twenty-two million, one hundred fifty-seven thousand, seven hundred ninety-one".