22115609 has 2 divisors, whose sum is σ = 22115610. Its totient is φ = 22115608.

The previous prime is 22115593. The next prime is 22115647. The reversal of 22115609 is 90651122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 697225 = 4628^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 22115609 - 2⁴ = 22115593 is a prime.

It is a super-2 number, since 2×22115609² = 978200322881762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22115669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11057804 + 11057805.

It is an arithmetic number, because the mean of its divisors is an integer number (11057805).

Almost surely, 2^22115609 is an apocalyptic number.

It is an amenable number.

22115609 is a deficient number, since it is larger than the sum of its proper divisors (1).

22115609 is an equidigital number, since it uses as much as digits as its factorization.

22115609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 22115609 is about 4702.7235725694. The cubic root of 22115609 is about 280.6938954657.

The spelling of 22115609 in words is "twenty-two million, one hundred fifteen thousand, six hundred nine".