171995497 has 2 divisors, whose sum is σ = 171995498. Its totient is φ = 171995496.

The previous prime is 171995479. The next prime is 171995503. The reversal of 171995497 is 794599171.

Together with previous prime (171995479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128051856 + 43943641 = 11316^2 + 6629^2 .

It is a cyclic number.

It is not a de Polignac number, because 171995497 - 2¹⁵ = 171962729 is a prime.

It is not a weakly prime, because it can be changed into another prime (171995297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85997748 + 85997749.

It is an arithmetic number, because the mean of its divisors is an integer number (85997749).

Almost surely, 2^171995497 is an apocalyptic number.

It is an amenable number.

171995497 is a deficient number, since it is larger than the sum of its proper divisors (1).

171995497 is an equidigital number, since it uses as much as digits as its factorization.

171995497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 52.

The square root of 171995497 is about 13114.7053722148. The cubic root of 171995497 is about 556.1249234075.

The spelling of 171995497 in words is "one hundred seventy-one million, nine hundred ninety-five thousand, four hundred ninety-seven".