7681889 has 2 divisors, whose sum is σ = 7681890. Its totient is φ = 7681888.

The previous prime is 7681879. The next prime is 7681937. The reversal of 7681889 is 9881867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7656289 + 25600 = 2767^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 7681889 - 2¹² = 7677793 is a prime.

It is a super-2 number, since 2×7681889² = 118022837216642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7681819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840944 + 3840945.

It is an arithmetic number, because the mean of its divisors is an integer number (3840945).

Almost surely, 2^7681889 is an apocalyptic number.

It is an amenable number.

7681889 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681889 is an equidigital number, since it uses as much as digits as its factorization.

7681889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 7681889 is about 2771.6220882364. The cubic root of 7681889 is about 197.3131405739.

The spelling of 7681889 in words is "seven million, six hundred eighty-one thousand, eight hundred eighty-nine".