7881313 has 4 divisors (see below), whose sum is σ = 8597808. Its totient is φ = 7164820.

The previous prime is 7881287. The next prime is 7881317. The reversal of 7881313 is 3131887.

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 7881313 - 2⁵ = 7881281 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7881317) 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, 358231 + ... + 358252.

It is an arithmetic number, because the mean of its divisors is an integer number (2149452).

Almost surely, 2^7881313 is an apocalyptic number.

It is an amenable number.

7881313 is a deficient number, since it is larger than the sum of its proper divisors (716495).

7881313 is a wasteful number, since it uses less digits than its factorization.

7881313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716494.

The product of its digits is 4032, while the sum is 31.

The square root of 7881313 is about 2807.3676282240. The cubic root of 7881313 is about 199.0060097677.

The spelling of 7881313 in words is "seven million, eight hundred eighty-one thousand, three hundred thirteen".