22158391 has 2 divisors, whose sum is σ = 22158392. Its totient is φ = 22158390.

The previous prime is 22158371. The next prime is 22158401. The reversal of 22158391 is 19385122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22158391 - 2⁹ = 22157879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22158371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11079195 + 11079196.

It is an arithmetic number, because the mean of its divisors is an integer number (11079196).

Almost surely, 2^22158391 is an apocalyptic number.

22158391 is a deficient number, since it is larger than the sum of its proper divisors (1).

22158391 is an equidigital number, since it uses as much as digits as its factorization.

22158391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 22158391 is about 4707.2700156248. The cubic root of 22158391 is about 280.8747769280.

The spelling of 22158391 in words is "twenty-two million, one hundred fifty-eight thousand, three hundred ninety-one".