171490999 has 2 divisors, whose sum is σ = 171491000. Its totient is φ = 171490998.

The previous prime is 171490961. The next prime is 171491003. The reversal of 171490999 is 999094171.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171490999 - 2⁷ = 171490871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171490919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85745499 + 85745500.

It is an arithmetic number, because the mean of its divisors is an integer number (85745500).

Almost surely, 2^171490999 is an apocalyptic number.

171490999 is a deficient number, since it is larger than the sum of its proper divisors (1).

171490999 is an equidigital number, since it uses as much as digits as its factorization.

171490999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 171490999 is about 13095.4571894226. The cubic root of 171490999 is about 555.5806481570.

The spelling of 171490999 in words is "one hundred seventy-one million, four hundred ninety thousand, nine hundred ninety-nine".