231822257 has 2 divisors, whose sum is σ = 231822258. Its totient is φ = 231822256.

The previous prime is 231822209. The next prime is 231822263. The reversal of 231822257 is 752228132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195328576 + 36493681 = 13976^2 + 6041^2 .

It is a cyclic number.

It is not a de Polignac number, because 231822257 - 2¹² = 231818161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231822277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115911128 + 115911129.

It is an arithmetic number, because the mean of its divisors is an integer number (115911129).

Almost surely, 2^231822257 is an apocalyptic number.

It is an amenable number.

231822257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231822257 is an equidigital number, since it uses as much as digits as its factorization.

231822257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 231822257 is about 15225.7103939356. The cubic root of 231822257 is about 614.3064046985.

The spelling of 231822257 in words is "two hundred thirty-one million, eight hundred twenty-two thousand, two hundred fifty-seven".