180685513 has 2 divisors, whose sum is σ = 180685514. Its totient is φ = 180685512.

The previous prime is 180685511. The next prime is 180685579. The reversal of 180685513 is 315586081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97456384 + 83229129 = 9872^2 + 9123^2 .

It is a cyclic number.

It is not a de Polignac number, because 180685513 - 2¹ = 180685511 is a prime.

Together with 180685511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (180685511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90342756 + 90342757.

It is an arithmetic number, because the mean of its divisors is an integer number (90342757).

Almost surely, 2^180685513 is an apocalyptic number.

It is an amenable number.

180685513 is a deficient number, since it is larger than the sum of its proper divisors (1).

180685513 is an equidigital number, since it uses as much as digits as its factorization.

180685513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 180685513 is about 13441.9311484623. The cubic root of 180685513 is about 565.3374787009.

The spelling of 180685513 in words is "one hundred eighty million, six hundred eighty-five thousand, five hundred thirteen".