231129317 has 4 divisors (see below), whose sum is σ = 231350700. Its totient is φ = 230907936.

The previous prime is 231129313. The next prime is 231129329. The reversal of 231129317 is 713921132.

231129317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 206468161 + 24661156 = 14369^2 + 4966^2 .

It is a cyclic number.

It is not a de Polignac number, because 231129317 - 2² = 231129313 is a prime.

It is a super-3 number, since 3×231129317³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231129317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231129313) 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, 109118 + ... + 111215.

It is an arithmetic number, because the mean of its divisors is an integer number (57837675).

Almost surely, 2^231129317 is an apocalyptic number.

It is an amenable number.

231129317 is a deficient number, since it is larger than the sum of its proper divisors (221383).

231129317 is a wasteful number, since it uses less digits than its factorization.

231129317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221382.

The product of its digits is 2268, while the sum is 29.

The square root of 231129317 is about 15202.9377753117. The cubic root of 231129317 is about 613.6937193274.

The spelling of 231129317 in words is "two hundred thirty-one million, one hundred twenty-nine thousand, three hundred seventeen".