3785091681 has 12 divisors (see below), whose sum is σ = 5870754672. Its totient is φ = 2162909448.

The previous prime is 3785091679. The next prime is 3785091691. The reversal of 3785091681 is 1861905873.

It is not a de Polignac number, because 3785091681 - 2¹ = 3785091679 is a prime.

It is a super-2 number, since 2×3785091681² = 28653838067150811522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3785091681.

It is not an unprimeable number, because it can be changed into a prime (3785091691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12874315 + ... + 12874608.

It is an arithmetic number, because the mean of its divisors is an integer number (489229556).

Almost surely, 2^3785091681 is an apocalyptic number.

It is an amenable number.

3785091681 is a deficient number, since it is larger than the sum of its proper divisors (2085662991).

3785091681 is a wasteful number, since it uses less digits than its factorization.

3785091681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25748940 (or 25748933 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 3785091681 is about 61523.0987597341. The cubic root of 3785091681 is about 1558.4473485842.

The spelling of 3785091681 in words is "three billion, seven hundred eighty-five million, ninety-one thousand, six hundred eighty-one".