7338821991 has 32 divisors (see below), whose sum is σ = 10758666240. Its totient is φ = 4429095264.

The previous prime is 7338821989. The next prime is 7338821993. The reversal of 7338821991 is 1991288337.

7338821991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7338821989) and next prime (7338821993).

It is not a de Polignac number, because 7338821991 - 2¹ = 7338821989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7338821993) 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 31 ways as a sum of consecutive naturals, for example, 1711336 + ... + 1715618.

It is an arithmetic number, because the mean of its divisors is an integer number (336208320).

Almost surely, 2^7338821991 is an apocalyptic number.

7338821991 is a deficient number, since it is larger than the sum of its proper divisors (3419844249).

7338821991 is a wasteful number, since it uses less digits than its factorization.

7338821991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635.

The product of its digits is 653184, while the sum is 51.

The square root of 7338821991 is about 85666.9247201042. The cubic root of 7338821991 is about 1943.3101449537.

The spelling of 7338821991 in words is "seven billion, three hundred thirty-eight million, eight hundred twenty-one thousand, nine hundred ninety-one".