180618521 has 2 divisors, whose sum is σ = 180618522. Its totient is φ = 180618520.

The previous prime is 180618491. The next prime is 180618551. The reversal of 180618521 is 125816081.

It is a balanced prime because it is at equal distance from previous prime (180618491) and next prime (180618551).

It can be written as a sum of positive squares in only one way, i.e., 177928921 + 2689600 = 13339^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 180618521 - 2⁶ = 180618457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (180618551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90309260 + 90309261.

It is an arithmetic number, because the mean of its divisors is an integer number (90309261).

Almost surely, 2^180618521 is an apocalyptic number.

It is an amenable number.

180618521 is a deficient number, since it is larger than the sum of its proper divisors (1).

180618521 is an equidigital number, since it uses as much as digits as its factorization.

180618521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 180618521 is about 13439.4390135898. The cubic root of 180618521 is about 565.2676008057.

The spelling of 180618521 in words is "one hundred eighty million, six hundred eighteen thousand, five hundred twenty-one".