18449591 has 2 divisors, whose sum is σ = 18449592. Its totient is φ = 18449590.

The previous prime is 18449579. The next prime is 18449603. The reversal of 18449591 is 19594481.

It is a balanced prime because it is at equal distance from previous prime (18449579) and next prime (18449603).

It is a cyclic number.

It is not a de Polignac number, because 18449591 - 2¹⁸ = 18187447 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 (18449531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224795 + 9224796.

It is an arithmetic number, because the mean of its divisors is an integer number (9224796).

Almost surely, 2^18449591 is an apocalyptic number.

18449591 is a deficient number, since it is larger than the sum of its proper divisors (1).

18449591 is an equidigital number, since it uses as much as digits as its factorization.

18449591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 18449591 is about 4295.2987090539. The cubic root of 18449591 is about 264.2381870499.

The spelling of 18449591 in words is "eighteen million, four hundred forty-nine thousand, five hundred ninety-one".