7213881691 has 4 divisors (see below), whose sum is σ = 7446587584. Its totient is φ = 6981175800.

The previous prime is 7213881673. The next prime is 7213881721. The reversal of 7213881691 is 1961883127.

It is a happy number.

7213881691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7213881691 - 2²³ = 7205493083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7213882691) 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, 116352900 + ... + 116352961.

It is an arithmetic number, because the mean of its divisors is an integer number (1861646896).

Almost surely, 2^7213881691 is an apocalyptic number.

7213881691 is a deficient number, since it is larger than the sum of its proper divisors (232705893).

7213881691 is a wasteful number, since it uses less digits than its factorization.

7213881691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232705892.

The product of its digits is 145152, while the sum is 46.

The square root of 7213881691 is about 84934.5730018112. The cubic root of 7213881691 is about 1932.2189563444.

The spelling of 7213881691 in words is "seven billion, two hundred thirteen million, eight hundred eighty-one thousand, six hundred ninety-one".