3979832091 has 4 divisors (see below), whose sum is σ = 5306442792. Its totient is φ = 2653221392.

The previous prime is 3979832069. The next prime is 3979832099. The reversal of 3979832091 is 1902389793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1902389793 = 3 ⋅634129931.

It is a cyclic number.

It is not a de Polignac number, because 3979832091 - 2¹⁹ = 3979307803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3979832099) 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, 663305346 + ... + 663305351.

It is an arithmetic number, because the mean of its divisors is an integer number (1326610698).

Almost surely, 2^3979832091 is an apocalyptic number.

3979832091 is a deficient number, since it is larger than the sum of its proper divisors (1326610701).

3979832091 is a wasteful number, since it uses less digits than its factorization.

3979832091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326610700.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 3979832091 is about 63085.9104000251. The cubic root of 3979832091 is about 1584.7286755726.

The spelling of 3979832091 in words is "three billion, nine hundred seventy-nine million, eight hundred thirty-two thousand, ninety-one".