231213578 has 8 divisors (see below), whose sum is σ = 358779780. Its totient is φ = 111620320.

The previous prime is 231213571. The next prime is 231213601. The reversal of 231213578 is 875312132.

It can be written as a sum of positive squares in 2 ways, for example, as 231131209 + 82369 = 15203^2 + 287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231213571) 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, 1993163 + ... + 1993278.

Almost surely, 2^231213578 is an apocalyptic number.

231213578 is a deficient number, since it is larger than the sum of its proper divisors (127566202).

231213578 is a wasteful number, since it uses less digits than its factorization.

231213578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986472.

The product of its digits is 10080, while the sum is 32.

The square root of 231213578 is about 15205.7087306051. The cubic root of 231213578 is about 613.7682867666.

The spelling of 231213578 in words is "two hundred thirty-one million, two hundred thirteen thousand, five hundred seventy-eight".