180899869 has 4 divisors (see below), whose sum is σ = 182220444. Its totient is φ = 179579296.

The previous prime is 180899867. The next prime is 180899879. The reversal of 180899869 is 968998081.

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 133702969 + 47196900 = 11563^2 + 6870^2 .

It is a cyclic number.

It is not a de Polignac number, because 180899869 - 2¹ = 180899867 is a prime.

It is a super-2 number, since 2×180899869² = 65449525208434322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180899861) 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 3 ways as a sum of consecutive naturals, for example, 660082 + ... + 660355.

It is an arithmetic number, because the mean of its divisors is an integer number (45555111).

Almost surely, 2^180899869 is an apocalyptic number.

It is an amenable number.

180899869 is a deficient number, since it is larger than the sum of its proper divisors (1320575).

180899869 is a wasteful number, since it uses less digits than its factorization.

180899869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320574.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 180899869 is about 13449.9021929529. The cubic root of 180899869 is about 565.5609527879.

The spelling of 180899869 in words is "one hundred eighty million, eight hundred ninety-nine thousand, eight hundred sixty-nine".