231249217 has 2 divisors, whose sum is σ = 231249218. Its totient is φ = 231249216.

The previous prime is 231249211. The next prime is 231249233. The reversal of 231249217 is 712942132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182682256 + 48566961 = 13516^2 + 6969^2 .

It is a cyclic number.

It is not a de Polignac number, because 231249217 - 2⁷ = 231249089 is a prime.

It is a super-2 number, since 2×231249217² = 106952400726226178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231249211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115624608 + 115624609.

It is an arithmetic number, because the mean of its divisors is an integer number (115624609).

Almost surely, 2^231249217 is an apocalyptic number.

It is an amenable number.

231249217 is a deficient number, since it is larger than the sum of its proper divisors (1).

231249217 is an equidigital number, since it uses as much as digits as its factorization.

231249217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 231249217 is about 15206.8805808423. The cubic root of 231249217 is about 613.7998203302.

It can be divided in two parts, 2312 and 49217, that added together give a square (51529 = 227²).

The spelling of 231249217 in words is "two hundred thirty-one million, two hundred forty-nine thousand, two hundred seventeen".