231395117 has 4 divisors (see below), whose sum is σ = 231540540. Its totient is φ = 231249696.

The previous prime is 231395093. The next prime is 231395137. The reversal of 231395117 is 711593132.

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 199967881 + 31427236 = 14141^2 + 5606^2 .

It is a cyclic number.

It is not a de Polignac number, because 231395117 - 2¹² = 231391021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231395137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70298 + ... + 73515.

It is an arithmetic number, because the mean of its divisors is an integer number (57885135).

Almost surely, 2^231395117 is an apocalyptic number.

It is an amenable number.

231395117 is a deficient number, since it is larger than the sum of its proper divisors (145423).

231395117 is a wasteful number, since it uses less digits than its factorization.

231395117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145422.

The product of its digits is 5670, while the sum is 32.

The square root of 231395117 is about 15211.6769949930. The cubic root of 231395117 is about 613.9288796020.

The spelling of 231395117 in words is "two hundred thirty-one million, three hundred ninety-five thousand, one hundred seventeen".