16222945 has 4 divisors (see below), whose sum is σ = 19467540. Its totient is φ = 12978352.

The previous prime is 16222939. The next prime is 16222961. The reversal of 16222945 is 54922261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5094049 + 11128896 = 2257^2 + 3336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16222945 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1622290 + ... + 1622299.

It is an arithmetic number, because the mean of its divisors is an integer number (4866885).

Almost surely, 2^16222945 is an apocalyptic number.

It is an amenable number.

16222945 is a deficient number, since it is larger than the sum of its proper divisors (3244595).

16222945 is an equidigital number, since it uses as much as digits as its factorization.

16222945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244594.

The product of its digits is 8640, while the sum is 31.

The square root of 16222945 is about 4027.7717164705. The cubic root of 16222945 is about 253.1492034977.

The spelling of 16222945 in words is "sixteen million, two hundred twenty-two thousand, nine hundred forty-five".