7961438369 has 2 divisors, whose sum is σ = 7961438370. Its totient is φ = 7961438368.

The previous prime is 7961438341. The next prime is 7961438417. The reversal of 7961438369 is 9638341697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4094464144 + 3866974225 = 63988^2 + 62185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7961438369 is a prime.

It is a super-2 number, since 2×7961438369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7961431369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3980719184 + 3980719185.

It is an arithmetic number, because the mean of its divisors is an integer number (3980719185).

Almost surely, 2^7961438369 is an apocalyptic number.

It is an amenable number.

7961438369 is a deficient number, since it is larger than the sum of its proper divisors (1).

7961438369 is an equidigital number, since it uses as much as digits as its factorization.

7961438369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 7961438369 is about 89226.8926333311. The cubic root of 7961438369 is about 1996.7813536866.

The spelling of 7961438369 in words is "seven billion, nine hundred sixty-one million, four hundred thirty-eight thousand, three hundred sixty-nine".