7912093891 has 4 divisors (see below), whose sum is σ = 8520716512. Its totient is φ = 7303471272.

The previous prime is 7912093837. The next prime is 7912093967. The reversal of 7912093891 is 1983902197.

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

It is a cyclic number.

It is not a de Polignac number, because 7912093891 - 2⁹ = 7912093379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7912093691) 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, 304311291 + ... + 304311316.

It is an arithmetic number, because the mean of its divisors is an integer number (2130179128).

Almost surely, 2^7912093891 is an apocalyptic number.

7912093891 is a deficient number, since it is larger than the sum of its proper divisors (608622621).

7912093891 is a wasteful number, since it uses less digits than its factorization.

7912093891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608622620.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 7912093891 is about 88949.9516076316. The cubic root of 7912093891 is about 1992.6474943698.

The spelling of 7912093891 in words is "seven billion, nine hundred twelve million, ninety-three thousand, eight hundred ninety-one".