185491 has 2 divisors, whose sum is σ = 185492. Its totient is φ = 185490.

The previous prime is 185483. The next prime is 185519. The reversal of 185491 is 194581.

It is a happy number.

185491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (185519) can be obtained adding 185491 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (194581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185491 - 2³ = 185483 is a prime.

It is a super-2 number, since 2×185491² = 68813822162, which contains 22 as substring.

It is equal to p₁₆₇₈₆ and since 185491 and 16786 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (185401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92745 + 92746.

It is an arithmetic number, because the mean of its divisors is an integer number (92746).

2¹⁸⁵⁴⁹¹ is an apocalyptic number.

185491 is a deficient number, since it is larger than the sum of its proper divisors (1).

185491 is an equidigital number, since it uses as much as digits as its factorization.

185491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 185491 is about 430.6866610426. The cubic root of 185491 is about 57.0305571255.

It can be divided in two parts, 185 and 491, that added together give a palindrome (676).

The spelling of 185491 in words is "one hundred eighty-five thousand, four hundred ninety-one".