22161609 has 6 divisors (see below), whose sum is σ = 32011226. Its totient is φ = 14774400.

The previous prime is 22161599. The next prime is 22161617. The reversal of 22161609 is 90616122.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 10791225 = 3372^2 + 3285^2 .

It is not a de Polignac number, because 22161609 - 2⁵ = 22161577 is a prime.

It is a super-2 number, since 2×22161609² = 982273826937762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1231192 + ... + 1231209.

Almost surely, 2^22161609 is an apocalyptic number.

It is an amenable number.

22161609 is a deficient number, since it is larger than the sum of its proper divisors (9849617).

22161609 is a wasteful number, since it uses less digits than its factorization.

22161609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462407 (or 2462404 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 22161609 is about 4707.6118149227. The cubic root of 22161609 is about 280.8883731511. Note that the first 3 decimals are identical.

The spelling of 22161609 in words is "twenty-two million, one hundred sixty-one thousand, six hundred nine".