791421919 has 4 divisors (see below), whose sum is σ = 818712360. Its totient is φ = 764131480.

The previous prime is 791421907. The next prime is 791421931. The reversal of 791421919 is 919124197.

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

It is an interprime number because it is at equal distance from previous prime (791421907) and next prime (791421931).

It is a cyclic number.

It is not a de Polignac number, because 791421919 - 2¹⁷ = 791290847 is a prime.

It is a super-2 number, since 2×791421919² = 1252697307747285122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791421989) 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, 13645177 + ... + 13645234.

It is an arithmetic number, because the mean of its divisors is an integer number (204678090).

Almost surely, 2^791421919 is an apocalyptic number.

791421919 is a deficient number, since it is larger than the sum of its proper divisors (27290441).

791421919 is a wasteful number, since it uses less digits than its factorization.

791421919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27290440.

The product of its digits is 40824, while the sum is 43.

The square root of 791421919 is about 28132.2220771840. Note that the first 3 decimals coincide. The cubic root of 791421919 is about 924.9878426452.

The spelling of 791421919 in words is "seven hundred ninety-one million, four hundred twenty-one thousand, nine hundred nineteen".