168694491 has 8 divisors (see below), whose sum is σ = 257058304. Its totient is φ = 96396840.

The previous prime is 168694469. The next prime is 168694499. The reversal of 168694491 is 194496861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 168694491 - 2⁹ = 168693979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168694491.

It is not an unprimeable number, because it can be changed into a prime (168694499) 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 in 7 ways as a sum of consecutive naturals, for example, 4016515 + ... + 4016556.

It is an arithmetic number, because the mean of its divisors is an integer number (32132288).

Almost surely, 2^168694491 is an apocalyptic number.

168694491 is a deficient number, since it is larger than the sum of its proper divisors (88363813).

168694491 is an equidigital number, since it uses as much as digits as its factorization.

168694491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8033081.

The product of its digits is 373248, while the sum is 48.

The square root of 168694491 is about 12988.2443386318. The cubic root of 168694491 is about 552.5441264757.

The spelling of 168694491 in words is "one hundred sixty-eight million, six hundred ninety-four thousand, four hundred ninety-one".