7681281 has 4 divisors (see below), whose sum is σ = 10241712. Its totient is φ = 5120852.

The previous prime is 7681243. The next prime is 7681283. The reversal of 7681281 is 1821867.

It is a happy number.

7681281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7681281 - 2⁷ = 7681153 is a prime.

It is a super-2 number, since 2×7681281² = 118004155601922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7681283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280211 + ... + 1280216.

It is an arithmetic number, because the mean of its divisors is an integer number (2560428).

Almost surely, 2^7681281 is an apocalyptic number.

It is an amenable number.

7681281 is a deficient number, since it is larger than the sum of its proper divisors (2560431).

7681281 is a wasteful number, since it uses less digits than its factorization.

7681281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560430.

The product of its digits is 5376, while the sum is 33.

The square root of 7681281 is about 2771.5124030031. The cubic root of 7681281 is about 197.3079348424.

The spelling of 7681281 in words is "seven million, six hundred eighty-one thousand, two hundred eighty-one".