7871963881 has 2 divisors, whose sum is σ = 7871963882. Its totient is φ = 7871963880.

The previous prime is 7871963867. The next prime is 7871963909. The reversal of 7871963881 is 1883691787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6673419481 + 1198544400 = 81691^2 + 34620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7871963881 is a prime.

It is a super-2 number, since 2×7871963881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7871963851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935981940 + 3935981941.

It is an arithmetic number, because the mean of its divisors is an integer number (3935981941).

Almost surely, 2^7871963881 is an apocalyptic number.

It is an amenable number.

7871963881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7871963881 is an equidigital number, since it uses as much as digits as its factorization.

7871963881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 7871963881 is about 88724.0885047573. The cubic root of 7871963881 is about 1989.2728908461.

The spelling of 7871963881 in words is "seven billion, eight hundred seventy-one million, nine hundred sixty-three thousand, eight hundred eighty-one".