231135206 has 4 divisors (see below), whose sum is σ = 346702812. Its totient is φ = 115567602.

The previous prime is 231135199. The next prime is 231135239. The reversal of 231135206 is 602531132.

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

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, 57783800 + ... + 57783803.

It is an arithmetic number, because the mean of its divisors is an integer number (86675703).

Almost surely, 2^231135206 is an apocalyptic number.

231135206 is a deficient number, since it is larger than the sum of its proper divisors (115567606).

231135206 is a wasteful number, since it uses less digits than its factorization.

231135206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115567605.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 231135206 is about 15203.1314537499. The cubic root of 231135206 is about 613.6989314336.

Adding to 231135206 its reverse (602531132), we get a palindrome (833666338).

The spelling of 231135206 in words is "two hundred thirty-one million, one hundred thirty-five thousand, two hundred six".