7481981 has 8 divisors (see below), whose sum is σ = 8118264. Its totient is φ = 6854400.

The previous prime is 7481939. The next prime is 7481983. The reversal of 7481981 is 1891847.

It can be written as a sum of positive squares in 4 ways, for example, as 7225 + 7474756 = 85^2 + 2734^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7481981 - 2⁶ = 7481917 is a prime.

It is a super-2 number, since 2×7481981² = 111960079368722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7481983) 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 7 ways as a sum of consecutive naturals, for example, 320 + ... + 3881.

It is an arithmetic number, because the mean of its divisors is an integer number (1014783).

Almost surely, 2^7481981 is an apocalyptic number.

It is an amenable number.

7481981 is a deficient number, since it is larger than the sum of its proper divisors (636283).

7481981 is a wasteful number, since it uses less digits than its factorization.

7481981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351.

The product of its digits is 16128, while the sum is 38.

The square root of 7481981 is about 2735.3210049279. The cubic root of 7481981 is about 195.5864963502.

The spelling of 7481981 in words is "seven million, four hundred eighty-one thousand, nine hundred eighty-one".