3694642181 has 6 divisors (see below), whose sum is σ = 3924758610. Its totient is φ = 3477310016.

The previous prime is 3694642177. The next prime is 3694642219. The reversal of 3694642181 is 1812464963.

It can be written as a sum of positive squares in 3 ways, for example, as 2051637025 + 1643005156 = 45295^2 + 40534^2 .

It is not a de Polignac number, because 3694642181 - 2² = 3694642177 is a prime.

It is a super-2 number, since 2×3694642181² = 27300761691248873522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3694642111) 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, 6391826 + ... + 6392403.

It is an arithmetic number, because the mean of its divisors is an integer number (654126435).

Almost surely, 2^3694642181 is an apocalyptic number.

It is an amenable number.

3694642181 is a deficient number, since it is larger than the sum of its proper divisors (230116429).

3694642181 is a wasteful number, since it uses less digits than its factorization.

3694642181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12784263 (or 12784246 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 3694642181 is about 60783.5683470459. The cubic root of 3694642181 is about 1545.9334515507.

The spelling of 3694642181 in words is "three billion, six hundred ninety-four million, six hundred forty-two thousand, one hundred eighty-one".