22209997 has 2 divisors, whose sum is σ = 22209998. Its totient is φ = 22209996.

The previous prime is 22209989. The next prime is 22210033. The reversal of 22209997 is 79990222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 948676 = 4611^2 + 974^2 .

It is a cyclic number.

It is not a de Polignac number, because 22209997 - 2³ = 22209989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22209947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11104998 + 11104999.

It is an arithmetic number, because the mean of its divisors is an integer number (11104999).

Almost surely, 2^22209997 is an apocalyptic number.

It is an amenable number.

22209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22209997 is an equidigital number, since it uses as much as digits as its factorization.

22209997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 22209997 is about 4712.7483488937. The cubic root of 22209997 is about 281.0926565513.

The spelling of 22209997 in words is "twenty-two million, two hundred nine thousand, nine hundred ninety-seven".