7881081 has 16 divisors (see below), whose sum is σ = 11983104. Its totient is φ = 4564224.

The previous prime is 7881079. The next prime is 7881089. The reversal of 7881081 is 1801887.

It is not a de Polignac number, because 7881081 - 2¹ = 7881079 is a prime.

It is a super-2 number, since 2×7881081² = 124222875457122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7881089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5281 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (748944).

Almost surely, 2^7881081 is an apocalyptic number.

It is an amenable number.

7881081 is a deficient number, since it is larger than the sum of its proper divisors (4102023).

7881081 is a wasteful number, since it uses less digits than its factorization.

7881081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11920.

The product of its (nonzero) digits is 3584, while the sum is 33.

The square root of 7881081 is about 2807.3263080732. The cubic root of 7881081 is about 199.0040570539.

The spelling of 7881081 in words is "seven million, eight hundred eighty-one thousand, eighty-one".