7939321849 has 2 divisors, whose sum is σ = 7939321850. Its totient is φ = 7939321848.

The previous prime is 7939321801. The next prime is 7939321913. The reversal of 7939321849 is 9481239397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7446481849 + 492840000 = 86293^2 + 22200^2 .

It is a cyclic number.

It is not a de Polignac number, because 7939321849 - 2²¹ = 7937224697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7939321849.

It is not a weakly prime, because it can be changed into another prime (7939322849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969660924 + 3969660925.

It is an arithmetic number, because the mean of its divisors is an integer number (3969660925).

Almost surely, 2^7939321849 is an apocalyptic number.

It is an amenable number.

7939321849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7939321849 is an equidigital number, since it uses as much as digits as its factorization.

7939321849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 55.

The square root of 7939321849 is about 89102.8722825477. The cubic root of 7939321849 is about 1994.9306491136.

The spelling of 7939321849 in words is "seven billion, nine hundred thirty-nine million, three hundred twenty-one thousand, eight hundred forty-nine".