3891091107 has 4 divisors (see below), whose sum is σ = 5188121480. Its totient is φ = 2594060736.

The previous prime is 3891091021. The next prime is 3891091109. The reversal of 3891091107 is 7011901983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7011901983 = 3 ⋅2337300661.

It is not a de Polignac number, because 3891091107 - 2¹⁹ = 3890566819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891091109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648515182 + ... + 648515187.

It is an arithmetic number, because the mean of its divisors is an integer number (1297030370).

Almost surely, 2^3891091107 is an apocalyptic number.

3891091107 is a deficient number, since it is larger than the sum of its proper divisors (1297030373).

3891091107 is a wasteful number, since it uses less digits than its factorization.

3891091107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297030372.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 3891091107 is about 62378.6109736342. The cubic root of 3891091107 is about 1572.8614438377.

The spelling of 3891091107 in words is "three billion, eight hundred ninety-one million, ninety-one thousand, one hundred seven".