169491 has 12 divisors (see below), whose sum is σ = 263112. Its totient is φ = 96768.

The previous prime is 169489. The next prime is 169493. The reversal of 169491 is 194961.

It is an interprime number because it is at equal distance from previous prime (169489) and next prime (169493).

It is not a de Polignac number, because 169491 - 2¹ = 169489 is a prime.

169491 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 169491.

It is not an unprimeable number, because it can be changed into a prime (169493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430 + ... + 723.

It is an arithmetic number, because the mean of its divisors is an integer number (21926).

2¹⁶⁹⁴⁹¹ is an apocalyptic number.

169491 is a deficient number, since it is larger than the sum of its proper divisors (93621).

169491 is a wasteful number, since it uses less digits than its factorization.

169491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1163 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 169491 is about 411.6928466709. The cubic root of 169491 is about 55.3412393342.

The spelling of 169491 in words is "one hundred sixty-nine thousand, four hundred ninety-one".