22161089 has 6 divisors (see below), whose sum is σ = 22455090. Its totient is φ = 21868176.

The previous prime is 22161077. The next prime is 22161101. The reversal of 22161089 is 98016122.

It is an interprime number because it is at equal distance from previous prime (22161077) and next prime (22161101).

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 6225025 = 3992^2 + 2495^2 .

It is not a de Polignac number, because 22161089 - 2⁸ = 22160833 is a prime.

It is a super-2 number, since 2×22161089² = 982227731331842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161289) 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, 44162 + ... + 44660.

It is an arithmetic number, because the mean of its divisors is an integer number (3742515).

Almost surely, 2^22161089 is an apocalyptic number.

It is an amenable number.

22161089 is a deficient number, since it is larger than the sum of its proper divisors (294001).

22161089 is an frugal number, since it uses more digits than its factorization.

22161089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 22161089 is about 4707.5565848962. The cubic root of 22161089 is about 280.8861762123.

The spelling of 22161089 in words is "twenty-two million, one hundred sixty-one thousand, eighty-nine".