180979489 has 4 divisors (see below), whose sum is σ = 181120324. Its totient is φ = 180838656.

The previous prime is 180979481. The next prime is 180979499. The reversal of 180979489 is 984979081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166410000 + 14569489 = 12900^2 + 3817^2 .

It is a cyclic number.

It is not a de Polignac number, because 180979489 - 2³ = 180979481 is a prime.

It is a super-2 number, since 2×180979489² = 65507150877402242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180979481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68472 + ... + 71065.

It is an arithmetic number, because the mean of its divisors is an integer number (45280081).

Almost surely, 2^180979489 is an apocalyptic number.

It is an amenable number.

180979489 is a deficient number, since it is larger than the sum of its proper divisors (140835).

180979489 is a wasteful number, since it uses less digits than its factorization.

180979489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140834.

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

The square root of 180979489 is about 13452.8617401652. The cubic root of 180979489 is about 565.6439146285.

The spelling of 180979489 in words is "one hundred eighty million, nine hundred seventy-nine thousand, four hundred eighty-nine".