22163261 has 2 divisors, whose sum is σ = 22163262. Its totient is φ = 22163260.

The previous prime is 22163201. The next prime is 22163263. The reversal of 22163261 is 16236122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21335161 + 828100 = 4619^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22163261 is a prime.

Together with 22163263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22163263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11081630 + 11081631.

It is an arithmetic number, because the mean of its divisors is an integer number (11081631).

Almost surely, 2^22163261 is an apocalyptic number.

It is an amenable number.

22163261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22163261 is an equidigital number, since it uses as much as digits as its factorization.

22163261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 22163261 is about 4707.7872721694. The cubic root of 22163261 is about 280.8953524287.

Adding to 22163261 its reverse (16236122), we get a palindrome (38399383).

The spelling of 22163261 in words is "twenty-two million, one hundred sixty-three thousand, two hundred sixty-one".