18324661 has 2 divisors, whose sum is σ = 18324662. Its totient is φ = 18324660.

The previous prime is 18324653. The next prime is 18324667. The reversal of 18324661 is 16642381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14676561 + 3648100 = 3831^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 18324661 - 2³ = 18324653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18324667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9162330 + 9162331.

It is an arithmetic number, because the mean of its divisors is an integer number (9162331).

Almost surely, 2^18324661 is an apocalyptic number.

It is an amenable number.

18324661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18324661 is an equidigital number, since it uses as much as digits as its factorization.

18324661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 18324661 is about 4280.7313627463. The cubic root of 18324661 is about 263.6404128337.

The spelling of 18324661 in words is "eighteen million, three hundred twenty-four thousand, six hundred sixty-one".