7820318491 has 4 divisors (see below), whose sum is σ = 7872804000. Its totient is φ = 7767832984.

The previous prime is 7820318479. The next prime is 7820318521. The reversal of 7820318491 is 1948130287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7820318491 - 2²¹ = 7818221339 is a prime.

It is a super-2 number, since 2×7820318491² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7820318411) 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, 26242531 + ... + 26242828.

It is an arithmetic number, because the mean of its divisors is an integer number (1968201000).

Almost surely, 2^7820318491 is an apocalyptic number.

7820318491 is a deficient number, since it is larger than the sum of its proper divisors (52485509).

7820318491 is a wasteful number, since it uses less digits than its factorization.

7820318491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52485508.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 7820318491 is about 88432.5646523949. The cubic root of 7820318491 is about 1984.9130185837.

The spelling of 7820318491 in words is "seven billion, eight hundred twenty million, three hundred eighteen thousand, four hundred ninety-one".