168491 has 2 divisors, whose sum is σ = 168492. Its totient is φ = 168490.

The previous prime is 168481. The next prime is 168499. The reversal of 168491 is 194861.

It is a strong prime.

It is an emirp because it is prime and its reverse (194861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168491 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 168491 parts by 580 straight cuts.

It is not a weakly prime, because it can be changed into another prime (168499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84245 + 84246.

It is an arithmetic number, because the mean of its divisors is an integer number (84246).

2¹⁶⁸⁴⁹¹ is an apocalyptic number.

168491 is a deficient number, since it is larger than the sum of its proper divisors (1).

168491 is an equidigital number, since it uses as much as digits as its factorization.

168491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 168491 is about 410.4765523145. The cubic root of 168491 is about 55.2321864728.

The spelling of 168491 in words is "one hundred sixty-eight thousand, four hundred ninety-one".