7439969681 has 2 divisors, whose sum is σ = 7439969682. Its totient is φ = 7439969680.

The previous prime is 7439969671. The next prime is 7439969683. The reversal of 7439969681 is 1869699347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7184257600 + 255712081 = 84760^2 + 15991^2 .

It is a cyclic number.

It is not a de Polignac number, because 7439969681 - 2⁶ = 7439969617 is a prime.

It is a super-2 number, since 2×7439969681² (a number of 21 digits) contains 22 as substring.

Together with 7439969683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7439969683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3719984840 + 3719984841.

It is an arithmetic number, because the mean of its divisors is an integer number (3719984841).

Almost surely, 2^7439969681 is an apocalyptic number.

It is an amenable number.

7439969681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7439969681 is an equidigital number, since it uses as much as digits as its factorization.

7439969681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 62.

The square root of 7439969681 is about 86255.2588599675. The cubic root of 7439969681 is about 1952.1973635076.

The spelling of 7439969681 in words is "seven billion, four hundred thirty-nine million, nine hundred sixty-nine thousand, six hundred eighty-one".