22170913 has 4 divisors (see below), whose sum is σ = 22190868. Its totient is φ = 22150960.

The previous prime is 22170851. The next prime is 22170931. The reversal of 22170913 is 31907122.

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 21603904 + 567009 = 4648^2 + 753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22170913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22170943) 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, 8206 + ... + 10567.

It is an arithmetic number, because the mean of its divisors is an integer number (5547717).

Almost surely, 2^22170913 is an apocalyptic number.

It is an amenable number.

22170913 is a deficient number, since it is larger than the sum of its proper divisors (19955).

22170913 is a wasteful number, since it uses less digits than its factorization.

22170913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19954.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 22170913 is about 4708.5998980589. The cubic root of 22170913 is about 280.9276756492.

The spelling of 22170913 in words is "twenty-two million, one hundred seventy thousand, nine hundred thirteen".