171099431 has 2 divisors, whose sum is σ = 171099432. Its totient is φ = 171099430.

The previous prime is 171099413. The next prime is 171099463. The reversal of 171099431 is 134990171.

It is a happy number.

Together with previous prime (171099413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171099431 - 2¹⁴ = 171083047 is a prime.

It is a super-2 number, since 2×171099431² = 58550030577047522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171099391 and 171099400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171099491) 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, 85549715 + 85549716.

It is an arithmetic number, because the mean of its divisors is an integer number (85549716).

Almost surely, 2^171099431 is an apocalyptic number.

171099431 is a deficient number, since it is larger than the sum of its proper divisors (1).

171099431 is an equidigital number, since it uses as much as digits as its factorization.

171099431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 171099431 is about 13080.4981174266. The cubic root of 171099431 is about 555.1574706697.

The spelling of 171099431 in words is "one hundred seventy-one million, ninety-nine thousand, four hundred thirty-one".