22155391 has 8 divisors (see below), whose sum is σ = 22997520. Its totient is φ = 21318528.

The previous prime is 22155373. The next prime is 22155407. The reversal of 22155391 is 19355122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22155391 - 2⁹ = 22154879 is a prime.

It is a super-2 number, since 2×22155391² = 981722700725762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8640 + ... + 10906.

It is an arithmetic number, because the mean of its divisors is an integer number (2874690).

Almost surely, 2^22155391 is an apocalyptic number.

22155391 is a deficient number, since it is larger than the sum of its proper divisors (842129).

22155391 is a wasteful number, since it uses less digits than its factorization.

22155391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633.

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

The square root of 22155391 is about 4706.9513488032. The cubic root of 22155391 is about 280.8621005810.

The spelling of 22155391 in words is "twenty-two million, one hundred fifty-five thousand, three hundred ninety-one".