22397491 has 2 divisors, whose sum is σ = 22397492. Its totient is φ = 22397490.

The previous prime is 22397477. The next prime is 22397509. The reversal of 22397491 is 19479322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22397491 - 2¹⁵ = 22364723 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22397491.

It is not a weakly prime, because it can be changed into another prime (22397411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11198745 + 11198746.

It is an arithmetic number, because the mean of its divisors is an integer number (11198746).

Almost surely, 2^22397491 is an apocalyptic number.

22397491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22397491 is an equidigital number, since it uses as much as digits as its factorization.

22397491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 22397491 is about 4732.5987575538. The cubic root of 22397491 is about 281.8814240845.

It can be divided in two parts, 2239 and 7491, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 22397491 in words is "twenty-two million, three hundred ninety-seven thousand, four hundred ninety-one".