7981147 has 2 divisors, whose sum is σ = 7981148. Its totient is φ = 7981146.

The previous prime is 7981139. The next prime is 7981151. The reversal of 7981147 is 7411897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7981147 - 2³ = 7981139 is a prime.

It is not a weakly prime, because it can be changed into another prime (7981247) 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, 3990573 + 3990574.

It is an arithmetic number, because the mean of its divisors is an integer number (3990574).

Almost surely, 2^7981147 is an apocalyptic number.

7981147 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981147 is an equidigital number, since it uses as much as digits as its factorization.

7981147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 7981147 is about 2825.0923878698. The cubic root of 7981147 is about 199.8427680897.

It can be divided in two parts, 7981 and 147, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 7981147 in words is "seven million, nine hundred eighty-one thousand, one hundred forty-seven".