231372217 has 8 divisors (see below), whose sum is σ = 236224800. Its totient is φ = 226550784.

The previous prime is 231372209. The next prime is 231372221. The reversal of 231372217 is 712273132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231372217 - 2³ = 231372209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231372017) 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 7 ways as a sum of consecutive naturals, for example, 7534 + ... + 22792.

It is an arithmetic number, because the mean of its divisors is an integer number (29528100).

Almost surely, 2^231372217 is an apocalyptic number.

It is an amenable number.

231372217 is a deficient number, since it is larger than the sum of its proper divisors (4852583).

231372217 is a wasteful number, since it uses less digits than its factorization.

231372217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15575.

The product of its digits is 3528, while the sum is 28.

The square root of 231372217 is about 15210.9242651458. The cubic root of 231372217 is about 613.9086264591.

The spelling of 231372217 in words is "two hundred thirty-one million, three hundred seventy-two thousand, two hundred seventeen".