22455391 has 4 divisors (see below), whose sum is σ = 25663312. Its totient is φ = 19247472.

The previous prime is 22455379. The next prime is 22455409. The reversal of 22455391 is 19355422.

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 22455391 - 2⁹ = 22454879 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 (22455491) 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, 1603950 + ... + 1603963.

It is an arithmetic number, because the mean of its divisors is an integer number (6415828).

Almost surely, 2^22455391 is an apocalyptic number.

22455391 is a deficient number, since it is larger than the sum of its proper divisors (3207921).

22455391 is an equidigital number, since it uses as much as digits as its factorization.

22455391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207920.

The product of its digits is 10800, while the sum is 31.

The square root of 22455391 is about 4738.7119557956. The cubic root of 22455391 is about 282.1241133335.

Adding to 22455391 its sum of digits (31), we get a palindrome (22455422).

The spelling of 22455391 in words is "twenty-two million, four hundred fifty-five thousand, three hundred ninety-one".