1791540813 has 4 divisors (see below), whose sum is σ = 2388721088. Its totient is φ = 1194360540.

The previous prime is 1791540791. The next prime is 1791540833. The reversal of 1791540813 is 3180451971.

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 de Polignac number, because none of the positive numbers 2^k-1791540813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791540833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298590133 + ... + 298590138.

It is an arithmetic number, because the mean of its divisors is an integer number (597180272).

Almost surely, 2^1791540813 is an apocalyptic number.

It is an amenable number.

1791540813 is a deficient number, since it is larger than the sum of its proper divisors (597180275).

1791540813 is an equidigital number, since it uses as much as digits as its factorization.

1791540813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597180274.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 1791540813 is about 42326.5969929074. The cubic root of 1791540813 is about 1214.5318327015.

The spelling of 1791540813 in words is "one billion, seven hundred ninety-one million, five hundred forty thousand, eight hundred thirteen".