22015397 has 2 divisors, whose sum is σ = 22015398. Its totient is φ = 22015396.

The previous prime is 22015387. The next prime is 22015403. The reversal of 22015397 is 79351022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 10719076 = 3361^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 22015397 - 2¹⁰ = 22014373 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 (22015337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11007698 + 11007699.

It is an arithmetic number, because the mean of its divisors is an integer number (11007699).

Almost surely, 2^22015397 is an apocalyptic number.

It is an amenable number.

22015397 is a deficient number, since it is larger than the sum of its proper divisors (1).

22015397 is an equidigital number, since it uses as much as digits as its factorization.

22015397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 22015397 is about 4692.0567984627. The cubic root of 22015397 is about 280.2692860030.

The spelling of 22015397 in words is "twenty-two million, fifteen thousand, three hundred ninety-seven".