22109261 has 2 divisors, whose sum is σ = 22109262. Its totient is φ = 22109260.

The previous prime is 22109257. The next prime is 22109273. The reversal of 22109261 is 16290122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22033636 + 75625 = 4694^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 22109261 - 2² = 22109257 is a prime.

It is a super-2 number, since 2×22109261² = 977638843932242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22109221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11054630 + 11054631.

It is an arithmetic number, because the mean of its divisors is an integer number (11054631).

Almost surely, 2^22109261 is an apocalyptic number.

It is an amenable number.

22109261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22109261 is an equidigital number, since it uses as much as digits as its factorization.

22109261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 22109261 is about 4702.0485960909. The cubic root of 22109261 is about 280.6670363762.

Adding to 22109261 its reverse (16290122), we get a palindrome (38399383).

The spelling of 22109261 in words is "twenty-two million, one hundred nine thousand, two hundred sixty-one".