18126491 has 2 divisors, whose sum is σ = 18126492. Its totient is φ = 18126490.

The previous prime is 18126481. The next prime is 18126499. The reversal of 18126491 is 19462181.

It is a strong prime.

It is an emirp because it is prime and its reverse (19462181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18126491 - 2¹⁰ = 18125467 is a prime.

It is not a weakly prime, because it can be changed into another prime (18126499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9063245 + 9063246.

It is an arithmetic number, because the mean of its divisors is an integer number (9063246).

Almost surely, 2^18126491 is an apocalyptic number.

18126491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18126491 is an equidigital number, since it uses as much as digits as its factorization.

18126491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 18126491 is about 4257.5216969500. The cubic root of 18126491 is about 262.6865962773.

The spelling of 18126491 in words is "eighteen million, one hundred twenty-six thousand, four hundred ninety-one".