7481391 has 16 divisors (see below), whose sum is σ = 10424160. Its totient is φ = 4766720.

The previous prime is 7481389. The next prime is 7481401. The reversal of 7481391 is 1931847.

7481391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7481391 - 2¹ = 7481389 is a prime.

It is a super-2 number, since 2×7481391² = 111942422589762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (7481351) 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 15 ways as a sum of consecutive naturals, for example, 9451 + ... + 10211.

It is an arithmetic number, because the mean of its divisors is an integer number (651510).

Almost surely, 2^7481391 is an apocalyptic number.

7481391 is a deficient number, since it is larger than the sum of its proper divisors (2942769).

7481391 is a wasteful number, since it uses less digits than its factorization.

7481391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 6048, while the sum is 33.

The square root of 7481391 is about 2735.2131543995. The cubic root of 7481391 is about 195.5813551509.

The spelling of 7481391 in words is "seven million, four hundred eighty-one thousand, three hundred ninety-one".