171257231 has 2 divisors, whose sum is σ = 171257232. Its totient is φ = 171257230.

The previous prime is 171257221. The next prime is 171257239. The reversal of 171257231 is 132752171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171257231 - 2¹⁰ = 171256207 is a prime.

It is a super-2 number, since 2×171257231² = 58658078339574722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 171257194 and 171257203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171257239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85628615 + 85628616.

It is an arithmetic number, because the mean of its divisors is an integer number (85628616).

Almost surely, 2^171257231 is an apocalyptic number.

171257231 is a deficient number, since it is larger than the sum of its proper divisors (1).

171257231 is an equidigital number, since it uses as much as digits as its factorization.

171257231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 29.

The square root of 171257231 is about 13086.5286076942. The cubic root of 171257231 is about 555.3280867274.

The spelling of 171257231 in words is "one hundred seventy-one million, two hundred fifty-seven thousand, two hundred thirty-one".