181913 has 2 divisors, whose sum is σ = 181914. Its totient is φ = 181912.

The previous prime is 181903. The next prime is 181919. The reversal of 181913 is 319181.

181913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120409 + 61504 = 347^2 + 248^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181913 is a prime.

It is a Chen prime.

It is equal to p₁₆₄₈₄ and since 181913 and 16484 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 (181919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90956 + 90957.

It is an arithmetic number, because the mean of its divisors is an integer number (90957).

2¹⁸¹⁹¹³ is an apocalyptic number.

It is an amenable number.

181913 is a deficient number, since it is larger than the sum of its proper divisors (1).

181913 is an equidigital number, since it uses as much as digits as its factorization.

181913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 23.

The square root of 181913 is about 426.5126023929. The cubic root of 181913 is about 56.6614797252.

The spelling of 181913 in words is "one hundred eighty-one thousand, nine hundred thirteen".