231978536 has 8 divisors (see below), whose sum is σ = 434959770. Its totient is φ = 115989264.

The previous prime is 231978521. The next prime is 231978553. The reversal of 231978536 is 635879132.

It can be written as a sum of positive squares in only one way, i.e., 148986436 + 82992100 = 12206^2 + 9110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14498651 + ... + 14498666.

Almost surely, 2^231978536 is an apocalyptic number.

It is an amenable number.

231978536 is a deficient number, since it is larger than the sum of its proper divisors (202981234).

231978536 is a wasteful number, since it uses less digits than its factorization.

231978536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28997323 (or 28997319 counting only the distinct ones).

The product of its digits is 272160, while the sum is 44.

The square root of 231978536 is about 15230.8416051116. The cubic root of 231978536 is about 614.4444150676. Note that the first 4 decimals are identical.

The spelling of 231978536 in words is "two hundred thirty-one million, nine hundred seventy-eight thousand, five hundred thirty-six".