185181413 has 2 divisors, whose sum is σ = 185181414. Its totient is φ = 185181412.

The previous prime is 185181341. The next prime is 185181431. The reversal of 185181413 is 314181581.

Together with next prime (185181431) it forms an Ormiston pair, because they use the same digits, order apart.

Together with previous prime (185181341) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164814244 + 20367169 = 12838^2 + 4513^2 .

It is a cyclic number.

It is not a de Polignac number, because 185181413 - 2¹⁰ = 185180389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 185181413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185181713) 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, 92590706 + 92590707.

It is an arithmetic number, because the mean of its divisors is an integer number (92590707).

Almost surely, 2^185181413 is an apocalyptic number.

It is an amenable number.

185181413 is a deficient number, since it is larger than the sum of its proper divisors (1).

185181413 is an equidigital number, since it uses as much as digits as its factorization.

185181413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 32.

The square root of 185181413 is about 13608.1377491558. The cubic root of 185181413 is about 569.9881119917.

The spelling of 185181413 in words is "one hundred eighty-five million, one hundred eighty-one thousand, four hundred thirteen".