18499541 has 2 divisors, whose sum is σ = 18499542. Its totient is φ = 18499540.

The previous prime is 18499517. The next prime is 18499561. The reversal of 18499541 is 14599481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 3062500 = 3929^2 + 1750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18499541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18499561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249770 + 9249771.

It is an arithmetic number, because the mean of its divisors is an integer number (9249771).

Almost surely, 2^18499541 is an apocalyptic number.

It is an amenable number.

18499541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499541 is an equidigital number, since it uses as much as digits as its factorization.

18499541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 18499541 is about 4301.1092755242. The cubic root of 18499541 is about 264.4764363069.

The spelling of 18499541 in words is "eighteen million, four hundred ninety-nine thousand, five hundred forty-one".