18260491 has 2 divisors, whose sum is σ = 18260492. Its totient is φ = 18260490.

The previous prime is 18260479. The next prime is 18260531. The reversal of 18260491 is 19406281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18260491 - 2¹⁹ = 17736203 is a prime.

It is a super-2 number, since 2×18260491² = 666891063122162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18260471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9130245 + 9130246.

It is an arithmetic number, because the mean of its divisors is an integer number (9130246).

Almost surely, 2^18260491 is an apocalyptic number.

18260491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18260491 is an equidigital number, since it uses as much as digits as its factorization.

18260491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18260491 is about 4273.2295749234. The cubic root of 18260491 is about 263.3323108793.

The spelling of 18260491 in words is "eighteen million, two hundred sixty thousand, four hundred ninety-one".