231380878 has 4 divisors (see below), whose sum is σ = 347071320. Its totient is φ = 115690438.

The previous prime is 231380861. The next prime is 231380899. The reversal of 231380878 is 878083132.

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

It is a super-2 number, since 2×231380878² = 107074221408101768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 231380878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57845218 + ... + 57845221.

It is an arithmetic number, because the mean of its divisors is an integer number (86767830).

Almost surely, 2^231380878 is an apocalyptic number.

231380878 is a deficient number, since it is larger than the sum of its proper divisors (115690442).

231380878 is a wasteful number, since it uses less digits than its factorization.

231380878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115690441.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 231380878 is about 15211.2089591853. The cubic root of 231380878 is about 613.9162865494.

The spelling of 231380878 in words is "two hundred thirty-one million, three hundred eighty thousand, eight hundred seventy-eight".