170431 has 4 divisors (see below), whose sum is σ = 171864. Its totient is φ = 169000.

The previous prime is 170413. The next prime is 170441. The reversal of 170431 is 134071.

It is a semiprime because it is the product of two primes.

It is a 3-Lehmer number, since φ(170431) divides (170431-1)³.

It is a cyclic number.

It is not a de Polignac number, because 170431 - 2⁹ = 169919 is a prime.

It is a super-2 number, since 2×170431² = 58093451522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (42966).

2¹⁷⁰⁴³¹ is an apocalyptic number.

170431 is a deficient number, since it is larger than the sum of its proper divisors (1433).

170431 is a wasteful number, since it uses less digits than its factorization.

170431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 170431 is about 412.8328959761. The cubic root of 170431 is about 55.4433586028.

The spelling of 170431 in words is "one hundred seventy thousand, four hundred thirty-one".