18249000521 has 2 divisors, whose sum is σ = 18249000522. Its totient is φ = 18249000520.

The previous prime is 18249000449. The next prime is 18249000533. The reversal of 18249000521 is 12500094281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17068116025 + 1180884496 = 130645^2 + 34364^2 .

It is a cyclic number.

It is not a de Polignac number, because 18249000521 - 2¹⁴ = 18248984137 is a prime.

It is not a weakly prime, because it can be changed into another prime (18249000541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124500260 + 9124500261.

It is an arithmetic number, because the mean of its divisors is an integer number (9124500261).

Almost surely, 2^18249000521 is an apocalyptic number.

It is an amenable number.

18249000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249000521 is an equidigital number, since it uses as much as digits as its factorization.

18249000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 18249000521 in words is "eighteen billion, two hundred forty-nine million, five hundred twenty-one", and thus it is an aban number.