18254491 has 2 divisors, whose sum is σ = 18254492. Its totient is φ = 18254490.

The previous prime is 18254461. The next prime is 18254503. The reversal of 18254491 is 19445281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18254491 - 2¹³ = 18246299 is a prime.

It is not a weakly prime, because it can be changed into another prime (18254461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9127245 + 9127246.

It is an arithmetic number, because the mean of its divisors is an integer number (9127246).

Almost surely, 2^18254491 is an apocalyptic number.

18254491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18254491 is an equidigital number, since it uses as much as digits as its factorization.

18254491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 18254491 is about 4272.5274721176. The cubic root of 18254491 is about 263.3034659640.

The spelling of 18254491 in words is "eighteen million, two hundred fifty-four thousand, four hundred ninety-one".