4491386991 has 72 divisors (see below), whose sum is σ = 8555230320. Its totient is φ = 2244340224.

The previous prime is 4491386959. The next prime is 4491387001. The reversal of 4491386991 is 1996831944.

It is a happy number.

4491386991 is a `hidden beast` number, since 4 + 491 + 3 + 8 + 69 + 91 = 666.

It is not a de Polignac number, because 4491386991 - 2⁵ = 4491386959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4491384991) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 88311 + ... + 129543.

Almost surely, 2^4491386991 is an apocalyptic number.

4491386991 is a deficient number, since it is larger than the sum of its proper divisors (4063843329).

4491386991 is a wasteful number, since it uses less digits than its factorization.

4491386991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41285 (or 41275 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 4491386991 is about 67017.8109982712. The cubic root of 4491386991 is about 1649.9096358225.

The spelling of 4491386991 in words is "four billion, four hundred ninety-one million, three hundred eighty-six thousand, nine hundred ninety-one".