18141491 has 2 divisors, whose sum is σ = 18141492. Its totient is φ = 18141490.

The previous prime is 18141469. The next prime is 18141509. The reversal of 18141491 is 19414181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18141491 - 2¹⁰ = 18140467 is a prime.

It is a super-2 number, since 2×18141491² = 658227391406162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18141191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070745 + 9070746.

It is an arithmetic number, because the mean of its divisors is an integer number (9070746).

Almost surely, 2^18141491 is an apocalyptic number.

18141491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18141491 is an equidigital number, since it uses as much as digits as its factorization.

18141491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 18141491 is about 4259.2829208683. The cubic root of 18141491 is about 262.7590356066.

The spelling of 18141491 in words is "eighteen million, one hundred forty-one thousand, four hundred ninety-one".