781807113 has 8 divisors (see below), whose sum is σ = 1158232800. Its totient is φ = 521204724.

The previous prime is 781807109. The next prime is 781807127. The reversal of 781807113 is 311708187.

781807113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 781807113 - 2² = 781807109 is a prime.

It is a super-2 number, since 2×781807113² = 1222444723874789538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781807153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14477883 + ... + 14477936.

It is an arithmetic number, because the mean of its divisors is an integer number (144779100).

Almost surely, 2^781807113 is an apocalyptic number.

It is an amenable number.

781807113 is a deficient number, since it is larger than the sum of its proper divisors (376425687).

781807113 is a wasteful number, since it uses less digits than its factorization.

781807113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28955828 (or 28955822 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

The square root of 781807113 is about 27960.8138830042. The cubic root of 781807113 is about 921.2267476382.

The spelling of 781807113 in words is "seven hundred eighty-one million, eight hundred seven thousand, one hundred thirteen".