4101491991 has 4 divisors (see below), whose sum is σ = 5468655992. Its totient is φ = 2734327992.

The previous prime is 4101491959. The next prime is 4101491993. The reversal of 4101491991 is 1991941014.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4101491991 - 2⁵ = 4101491959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4101491993) 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, 683581996 + ... + 683582001.

It is an arithmetic number, because the mean of its divisors is an integer number (1367163998).

Almost surely, 2^4101491991 is an apocalyptic number.

4101491991 is a deficient number, since it is larger than the sum of its proper divisors (1367164001).

4101491991 is a wasteful number, since it uses less digits than its factorization.

4101491991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367164000.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 4101491991 is about 64042.8918069757. The cubic root of 4101491991 is about 1600.7147836250.

The spelling of 4101491991 in words is "four billion, one hundred one million, four hundred ninety-one thousand, nine hundred ninety-one".