7981871 has 2 divisors, whose sum is σ = 7981872. Its totient is φ = 7981870.

The previous prime is 7981867. The next prime is 7981877. The reversal of 7981871 is 1781897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7981871 - 2² = 7981867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990935 + 3990936.

It is an arithmetic number, because the mean of its divisors is an integer number (3990936).

Almost surely, 2^7981871 is an apocalyptic number.

7981871 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981871 is an equidigital number, since it uses as much as digits as its factorization.

7981871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 41.

The square root of 7981871 is about 2825.2205223664. The cubic root of 7981871 is about 199.8488107378.

The spelling of 7981871 in words is "seven million, nine hundred eighty-one thousand, eight hundred seventy-one".