194415813 has 6 divisors (see below), whose sum is σ = 280822854. Its totient is φ = 129610536.

The previous prime is 194415811. The next prime is 194415817. The reversal of 194415813 is 318514491.

194415813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 180150084 + 14265729 = 13422^2 + 3777^2 .

It is not a de Polignac number, because 194415813 - 2¹ = 194415811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194415811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10800870 + ... + 10800887.

It is an arithmetic number, because the mean of its divisors is an integer number (46803809).

Almost surely, 2^194415813 is an apocalyptic number.

It is an amenable number.

194415813 is a deficient number, since it is larger than the sum of its proper divisors (86407041).

194415813 is a wasteful number, since it uses less digits than its factorization.

194415813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21601763 (or 21601760 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 194415813 is about 13943.3071041271. The cubic root of 194415813 is about 579.3093374194.

The spelling of 194415813 in words is "one hundred ninety-four million, four hundred fifteen thousand, eight hundred thirteen".