3891091658 has 16 divisors (see below), whose sum is σ = 5861119176. Its totient is φ = 1937402880.

The previous prime is 3891091657. The next prime is 3891091661. The reversal of 3891091658 is 8561901983.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3356695969 + 534395689 = 57937^2 + 23117^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3891091657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495410 + ... + 503202.

Almost surely, 2^3891091658 is an apocalyptic number.

3891091658 is a deficient number, since it is larger than the sum of its proper divisors (1970027518).

3891091658 is a wasteful number, since it uses less digits than its factorization.

3891091658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8809.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 3891091658 is about 62378.6153902121. The cubic root of 3891091658 is about 1572.8615180796.

The spelling of 3891091658 in words is "three billion, eight hundred ninety-one million, ninety-one thousand, six hundred fifty-eight".