180479989 has 2 divisors, whose sum is σ = 180479990. Its totient is φ = 180479988.

The previous prime is 180479951. The next prime is 180480037. The reversal of 180479989 is 989974081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164916964 + 15563025 = 12842^2 + 3945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180479989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180419989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90239994 + 90239995.

It is an arithmetic number, because the mean of its divisors is an integer number (90239995).

Almost surely, 2^180479989 is an apocalyptic number.

It is an amenable number.

180479989 is a deficient number, since it is larger than the sum of its proper divisors (1).

180479989 is an equidigital number, since it uses as much as digits as its factorization.

180479989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 180479989 is about 13434.2840895970. The cubic root of 180479989 is about 565.1230462685.

The spelling of 180479989 in words is "one hundred eighty million, four hundred seventy-nine thousand, nine hundred eighty-nine".