171431969 has 2 divisors, whose sum is σ = 171431970. Its totient is φ = 171431968.

The previous prime is 171431879. The next prime is 171431977. The reversal of 171431969 is 969134171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166539025 + 4892944 = 12905^2 + 2212^2 .

It is an emirp because it is prime and its reverse (969134171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171431969 - 2⁸ = 171431713 is a prime.

It is a super-2 number, since 2×171431969² = 58777839990433922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171431269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85715984 + 85715985.

It is an arithmetic number, because the mean of its divisors is an integer number (85715985).

Almost surely, 2^171431969 is an apocalyptic number.

It is an amenable number.

171431969 is a deficient number, since it is larger than the sum of its proper divisors (1).

171431969 is an equidigital number, since it uses as much as digits as its factorization.

171431969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 171431969 is about 13093.2031604188. The cubic root of 171431969 is about 555.5168942000.

The spelling of 171431969 in words is "one hundred seventy-one million, four hundred thirty-one thousand, nine hundred sixty-nine".