7881937849 has 2 divisors, whose sum is σ = 7881937850. Its totient is φ = 7881937848.

The previous prime is 7881937837. The next prime is 7881937859. The reversal of 7881937849 is 9487391887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7528685824 + 353252025 = 86768^2 + 18795^2 .

It is an emirp because it is prime and its reverse (9487391887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7881937849 - 2⁹ = 7881937337 is a prime.

It is not a weakly prime, because it can be changed into another prime (7881937859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940968924 + 3940968925.

It is an arithmetic number, because the mean of its divisors is an integer number (3940968925).

Almost surely, 2^7881937849 is an apocalyptic number.

It is an amenable number.

7881937849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881937849 is an equidigital number, since it uses as much as digits as its factorization.

7881937849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 64.

The square root of 7881937849 is about 88780.2784913406. The cubic root of 7881937849 is about 1990.1126885001.

The spelling of 7881937849 in words is "seven billion, eight hundred eighty-one million, nine hundred thirty-seven thousand, eight hundred forty-nine".