185345813 has 4 divisors (see below), whose sum is σ = 186306348. Its totient is φ = 184385280.

The previous prime is 185345777. The next prime is 185345821. The reversal of 185345813 is 318543581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39853969 + 145491844 = 6313^2 + 12062^2 .

It is a cyclic number.

It is not a de Polignac number, because 185345813 - 2⁶ = 185345749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185345113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479978 + ... + 480363.

It is an arithmetic number, because the mean of its divisors is an integer number (46576587).

Almost surely, 2^185345813 is an apocalyptic number.

It is an amenable number.

185345813 is a deficient number, since it is larger than the sum of its proper divisors (960535).

185345813 is an equidigital number, since it uses as much as digits as its factorization.

185345813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960534.

The product of its digits is 57600, while the sum is 38.

The square root of 185345813 is about 13614.1769123219. The cubic root of 185345813 is about 570.1567364192.

The spelling of 185345813 in words is "one hundred eighty-five million, three hundred forty-five thousand, eight hundred thirteen".