180538649 has 2 divisors, whose sum is σ = 180538650. Its totient is φ = 180538648.

The previous prime is 180538619. The next prime is 180538663. The reversal of 180538649 is 946835081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106234249 + 74304400 = 10307^2 + 8620^2 .

It is a cyclic number.

It is not a de Polignac number, because 180538649 - 2¹² = 180534553 is a prime.

It is not a weakly prime, because it can be changed into another prime (180538619) 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, 90269324 + 90269325.

It is an arithmetic number, because the mean of its divisors is an integer number (90269325).

Almost surely, 2^180538649 is an apocalyptic number.

It is an amenable number.

180538649 is a deficient number, since it is larger than the sum of its proper divisors (1).

180538649 is an equidigital number, since it uses as much as digits as its factorization.

180538649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 180538649 is about 13436.4671323976. The cubic root of 180538649 is about 565.1842654785.

The spelling of 180538649 in words is "one hundred eighty million, five hundred thirty-eight thousand, six hundred forty-nine".