8077981 has 4 divisors (see below), whose sum is σ = 8156512. Its totient is φ = 7999452.

The previous prime is 8077973. The next prime is 8078003. The reversal of 8077981 is 1897708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8077981 - 2³ = 8077973 is a prime.

It is a super-2 number, since 2×8077981² = 130507554072722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8071981) 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 in 3 ways as a sum of consecutive naturals, for example, 39111 + ... + 39316.

It is an arithmetic number, because the mean of its divisors is an integer number (2039128).

Almost surely, 2^8077981 is an apocalyptic number.

It is an amenable number.

8077981 is a deficient number, since it is larger than the sum of its proper divisors (78531).

8077981 is a wasteful number, since it uses less digits than its factorization.

8077981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78530.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 8077981 is about 2842.1789176616. The cubic root of 8077981 is about 200.6477415563.

The spelling of 8077981 in words is "eight million, seventy-seven thousand, nine hundred eighty-one".