180557121 has 16 divisors (see below), whose sum is σ = 245064960. Its totient is φ = 118227600.

The previous prime is 180557099. The next prime is 180557123. The reversal of 180557121 is 121755081.

It is not a de Polignac number, because 180557121 - 2¹⁹ = 180032833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180557123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42546 + ... + 46596.

It is an arithmetic number, because the mean of its divisors is an integer number (15316560).

Almost surely, 2^180557121 is an apocalyptic number.

It is an amenable number.

180557121 is a deficient number, since it is larger than the sum of its proper divisors (64507839).

180557121 is a wasteful number, since it uses less digits than its factorization.

180557121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316.

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 180557121 is about 13437.1544978838. The cubic root of 180557121 is about 565.2035406268.

The spelling of 180557121 in words is "one hundred eighty million, five hundred fifty-seven thousand, one hundred twenty-one".