22155431 has 4 divisors (see below), whose sum is σ = 22573512. Its totient is φ = 21737352.

The previous prime is 22155407. The next prime is 22155433. The reversal of 22155431 is 13455122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22155431 is a prime.

It is a super-2 number, since 2×22155431² = 981726245591522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22155397 and 22155406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155433) 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, 208961 + ... + 209066.

It is an arithmetic number, because the mean of its divisors is an integer number (5643378).

Almost surely, 2^22155431 is an apocalyptic number.

22155431 is a deficient number, since it is larger than the sum of its proper divisors (418081).

22155431 is an equidigital number, since it uses as much as digits as its factorization.

22155431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418080.

The product of its digits is 1200, while the sum is 23.

The square root of 22155431 is about 4706.9555978360. The cubic root of 22155431 is about 280.8622696065.

The spelling of 22155431 in words is "twenty-two million, one hundred fifty-five thousand, four hundred thirty-one".