791487991 has 4 divisors (see below), whose sum is σ = 904557712. Its totient is φ = 678418272.

The previous prime is 791487953. The next prime is 791488007. The reversal of 791487991 is 199784197.

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

It is not a de Polignac number, because 791487991 - 2¹¹ = 791485943 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 (791487901) 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 3 ways as a sum of consecutive naturals, for example, 56534850 + ... + 56534863.

It is an arithmetic number, because the mean of its divisors is an integer number (226139428).

Almost surely, 2^791487991 is an apocalyptic number.

791487991 is a deficient number, since it is larger than the sum of its proper divisors (113069721).

791487991 is a wasteful number, since it uses less digits than its factorization.

791487991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113069720.

The product of its digits is 1143072, while the sum is 55.

The square root of 791487991 is about 28133.3963644634. The cubic root of 791487991 is about 925.0135828539.

The spelling of 791487991 in words is "seven hundred ninety-one million, four hundred eighty-seven thousand, nine hundred ninety-one".