231933217 has 2 divisors, whose sum is σ = 231933218. Its totient is φ = 231933216.

The previous prime is 231933197. The next prime is 231933223. The reversal of 231933217 is 712339132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215032896 + 16900321 = 14664^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 231933217 - 2⁷ = 231933089 is a prime.

It is not a weakly prime, because it can be changed into another prime (231933257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115966608 + 115966609.

It is an arithmetic number, because the mean of its divisors is an integer number (115966609).

Almost surely, 2^231933217 is an apocalyptic number.

It is an amenable number.

231933217 is a deficient number, since it is larger than the sum of its proper divisors (1).

231933217 is an equidigital number, since it uses as much as digits as its factorization.

231933217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 31.

The square root of 231933217 is about 15229.3537945640. The cubic root of 231933217 is about 614.4044001299.

The spelling of 231933217 in words is "two hundred thirty-one million, nine hundred thirty-three thousand, two hundred seventeen".