185505413 has 2 divisors, whose sum is σ = 185505414. Its totient is φ = 185505412.

The previous prime is 185505409. The next prime is 185505421. The reversal of 185505413 is 314505581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 46689889 = 11782^2 + 6833^2 .

It is a cyclic number.

It is not a de Polignac number, because 185505413 - 2² = 185505409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 185505413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185505403) 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 as a sum of consecutive naturals, namely, 92752706 + 92752707.

It is an arithmetic number, because the mean of its divisors is an integer number (92752707).

Almost surely, 2^185505413 is an apocalyptic number.

It is an amenable number.

185505413 is a deficient number, since it is larger than the sum of its proper divisors (1).

185505413 is an equidigital number, since it uses as much as digits as its factorization.

185505413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 185505413 is about 13620.0371879081. The cubic root of 185505413 is about 570.3203421447.

The spelling of 185505413 in words is "one hundred eighty-five million, five hundred five thousand, four hundred thirteen".