7742891329 has 2 divisors, whose sum is σ = 7742891330. Its totient is φ = 7742891328.

The previous prime is 7742891311. The next prime is 7742891333. The reversal of 7742891329 is 9231982477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3963961600 + 3778929729 = 62960^2 + 61473^2 .

It is an emirp because it is prime and its reverse (9231982477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7742891329 - 2⁹ = 7742890817 is a prime.

It is a super-2 number, since 2×7742891329² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7742891309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3871445664 + 3871445665.

It is an arithmetic number, because the mean of its divisors is an integer number (3871445665).

Almost surely, 2^7742891329 is an apocalyptic number.

It is an amenable number.

7742891329 is a deficient number, since it is larger than the sum of its proper divisors (1).

7742891329 is an equidigital number, since it uses as much as digits as its factorization.

7742891329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 7742891329 is about 87993.7005074795. The cubic root of 7742891329 is about 1978.3405584734.

The spelling of 7742891329 in words is "seven billion, seven hundred forty-two million, eight hundred ninety-one thousand, three hundred twenty-nine".