18290491 has 2 divisors, whose sum is σ = 18290492. Its totient is φ = 18290490.

The previous prime is 18290477. The next prime is 18290507. The reversal of 18290491 is 19409281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18290491 - 2⁹ = 18289979 is a prime.

It is a super-2 number, since 2×18290491² = 669084122042162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18290401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145245 + 9145246.

It is an arithmetic number, because the mean of its divisors is an integer number (9145246).

Almost surely, 2^18290491 is an apocalyptic number.

18290491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18290491 is an equidigital number, since it uses as much as digits as its factorization.

18290491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18290491 is about 4276.7383600122. The cubic root of 18290491 is about 263.4764407570.

It can be divided in two parts, 18290 and 491, that added together give a palindrome (18781).

The spelling of 18290491 in words is "eighteen million, two hundred ninety thousand, four hundred ninety-one".