7885681 has 2 divisors, whose sum is σ = 7885682. Its totient is φ = 7885680.

The previous prime is 7885649. The next prime is 7885693. The reversal of 7885681 is 1865887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5880625 + 2005056 = 2425^2 + 1416^2 .

It is an emirp because it is prime and its reverse (1865887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7885681 - 2⁵ = 7885649 is a prime.

It is a super-2 number, since 2×7885681² = 124367929667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7885621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3942840 + 3942841.

It is an arithmetic number, because the mean of its divisors is an integer number (3942841).

Almost surely, 2^7885681 is an apocalyptic number.

It is an amenable number.

7885681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7885681 is an equidigital number, since it uses as much as digits as its factorization.

7885681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 43.

The square root of 7885681 is about 2808.1454734397. The cubic root of 7885681 is about 199.0427675056.

The spelling of 7885681 in words is "seven million, eight hundred eighty-five thousand, six hundred eighty-one".