22291639 has 2 divisors, whose sum is σ = 22291640. Its totient is φ = 22291638.

The previous prime is 22291613. The next prime is 22291651. The reversal of 22291639 is 93619222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22291639 - 2⁹ = 22291127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22291679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11145819 + 11145820.

It is an arithmetic number, because the mean of its divisors is an integer number (11145820).

Almost surely, 2^22291639 is an apocalyptic number.

22291639 is a deficient number, since it is larger than the sum of its proper divisors (1).

22291639 is an equidigital number, since it uses as much as digits as its factorization.

22291639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 22291639 is about 4721.4022281521. The cubic root of 22291639 is about 281.4366593666.

The spelling of 22291639 in words is "twenty-two million, two hundred ninety-one thousand, six hundred thirty-nine".