22391155 has 4 divisors (see below), whose sum is σ = 26869392. Its totient is φ = 17912920.

The previous prime is 22391153. The next prime is 22391191. The reversal of 22391155 is 55119322.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22391155 - 2¹ = 22391153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22391153) 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, 2239111 + ... + 2239120.

It is an arithmetic number, because the mean of its divisors is an integer number (6717348).

Almost surely, 2^22391155 is an apocalyptic number.

22391155 is a deficient number, since it is larger than the sum of its proper divisors (4478237).

22391155 is an equidigital number, since it uses as much as digits as its factorization.

22391155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478236.

The product of its digits is 2700, while the sum is 28.

The square root of 22391155 is about 4731.9293105455. The cubic root of 22391155 is about 281.8548412091.

It can be divided in two parts, 223 and 91155, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 22391155 in words is "twenty-two million, three hundred ninety-one thousand, one hundred fifty-five".