231090604978 has 4 divisors (see below), whose sum is σ = 346635907470. Its totient is φ = 115545302488.

The previous prime is 231090604931. The next prime is 231090604981. The reversal of 231090604978 is 879406090132.

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

It can be written as a sum of positive squares in only one way, i.e., 221815566729 + 9275038249 = 470973^2 + 96307^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57772651243 + ... + 57772651246.

Almost surely, 2^231090604978 is an apocalyptic number.

231090604978 is a deficient number, since it is larger than the sum of its proper divisors (115545302492).

231090604978 is a wasteful number, since it uses less digits than its factorization.

231090604978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115545302491.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 231090604978 in words is "two hundred thirty-one billion, ninety million, six hundred four thousand, nine hundred seventy-eight".