171431257 has 2 divisors, whose sum is σ = 171431258. Its totient is φ = 171431256.

The previous prime is 171431207. The next prime is 171431261. The reversal of 171431257 is 752134171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132043081 + 39388176 = 11491^2 + 6276^2 .

It is a cyclic number.

It is not a de Polignac number, because 171431257 - 2²⁷ = 37213529 is a prime.

It is not a weakly prime, because it can be changed into another prime (171431207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85715628 + 85715629.

It is an arithmetic number, because the mean of its divisors is an integer number (85715629).

Almost surely, 2^171431257 is an apocalyptic number.

It is an amenable number.

171431257 is a deficient number, since it is larger than the sum of its proper divisors (1).

171431257 is an equidigital number, since it uses as much as digits as its factorization.

171431257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 171431257 is about 13093.1759707108. The cubic root of 171431257 is about 555.5161251319.

The spelling of 171431257 in words is "one hundred seventy-one million, four hundred thirty-one thousand, two hundred fifty-seven".