22231997 has 2 divisors, whose sum is σ = 22231998. Its totient is φ = 22231996.

The previous prime is 22231981. The next prime is 22232011. The reversal of 22231997 is 79913222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 10201 = 4714^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 22231997 - 2⁴ = 22231981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22231897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11115998 + 11115999.

It is an arithmetic number, because the mean of its divisors is an integer number (11115999).

Almost surely, 2^22231997 is an apocalyptic number.

It is an amenable number.

22231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22231997 is an equidigital number, since it uses as much as digits as its factorization.

22231997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 22231997 is about 4715.0818656732. The cubic root of 22231997 is about 281.1854375591.

The spelling of 22231997 in words is "twenty-two million, two hundred thirty-one thousand, nine hundred ninety-seven".