180478381 has 4 divisors (see below), whose sum is σ = 180671932. Its totient is φ = 180284832.

The previous prime is 180478349. The next prime is 180478387. The reversal of 180478381 is 183874081.

180478381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 23377225 + 157101156 = 4835^2 + 12534^2 .

It is a cyclic number.

It is not a de Polignac number, because 180478381 - 2⁵ = 180478349 is a prime.

It is a super-2 number, since 2×180478381² = 65144892016762322, 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 (180478387) 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, 95370 + ... + 97243.

It is an arithmetic number, because the mean of its divisors is an integer number (45167983).

Almost surely, 2^180478381 is an apocalyptic number.

It is an amenable number.

180478381 is a deficient number, since it is larger than the sum of its proper divisors (193551).

180478381 is an equidigital number, since it uses as much as digits as its factorization.

180478381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193550.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 180478381 is about 13434.2242425828. The cubic root of 180478381 is about 565.1213679281.

The spelling of 180478381 in words is "one hundred eighty million, four hundred seventy-eight thousand, three hundred eighty-one".