7491981 has 8 divisors (see below), whose sum is σ = 11416384. Its totient is φ = 4281120.

The previous prime is 7491973. The next prime is 7492031. The reversal of 7491981 is 1891947.

It is a happy number.

7491981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7491981 - 2³ = 7491973 is a prime.

It is a super-2 number, since 2×7491981² = 112259558608722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7491901) 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 7 ways as a sum of consecutive naturals, for example, 178360 + ... + 178401.

It is an arithmetic number, because the mean of its divisors is an integer number (1427048).

Almost surely, 2^7491981 is an apocalyptic number.

It is an amenable number.

7491981 is a deficient number, since it is larger than the sum of its proper divisors (3924403).

7491981 is a wasteful number, since it uses less digits than its factorization.

7491981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356771.

The product of its digits is 18144, while the sum is 39.

The square root of 7491981 is about 2737.1483335764. The cubic root of 7491981 is about 195.6735942388.

The spelling of 7491981 in words is "seven million, four hundred ninety-one thousand, nine hundred eighty-one".