7881919 has 2 divisors, whose sum is σ = 7881920. Its totient is φ = 7881918.

The previous prime is 7881917. The next prime is 7881959. The reversal of 7881919 is 9191887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7881919 - 2¹ = 7881917 is a prime.

It is a super-2 number, since 2×7881919² = 124249294245122, which contains 22 as substring.

Together with 7881917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7881911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940959 + 3940960.

It is an arithmetic number, because the mean of its divisors is an integer number (3940960).

Almost surely, 2^7881919 is an apocalyptic number.

7881919 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881919 is an equidigital number, since it uses as much as digits as its factorization.

7881919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 43.

The square root of 7881919 is about 2807.4755564386. The cubic root of 7881919 is about 199.0111102102.

The spelling of 7881919 in words is "seven million, eight hundred eighty-one thousand, nine hundred nineteen".