7981281 has 48 divisors (see below), whose sum is σ = 14896000. Its totient is φ = 4134240.

The previous prime is 7981247. The next prime is 7981283. The reversal of 7981281 is 1821897.

7981281 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7981281 - 2¹³ = 7973089 is a prime.

It is a super-2 number, since 2×7981281² = 127401692801922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (7981283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22695 + ... + 23043.

Almost surely, 2^7981281 is an apocalyptic number.

It is an amenable number.

7981281 is a deficient number, since it is larger than the sum of its proper divisors (6914719).

7981281 is a wasteful number, since it uses less digits than its factorization.

7981281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 370 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 7981281 is about 2825.1161038088. The cubic root of 7981281 is about 199.8438865079.

The spelling of 7981281 in words is "seven million, nine hundred eighty-one thousand, two hundred eighty-one".