781838112113 has 2 divisors, whose sum is σ = 781838112114. Its totient is φ = 781838112112.

The previous prime is 781838112101. The next prime is 781838112157. The reversal of 781838112113 is 311211838187.

781838112113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (781838112157) can be obtained adding 781838112113 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776666776369 + 5171335744 = 881287^2 + 71912^2 .

It is a cyclic number.

It is not a de Polignac number, because 781838112113 - 2¹² = 781838108017 is a prime.

It is a super-2 number, since 2×781838112113² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781838112173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390919056056 + 390919056057.

It is an arithmetic number, because the mean of its divisors is an integer number (390919056057).

Almost surely, 2^781838112113 is an apocalyptic number.

It is an amenable number.

781838112113 is a deficient number, since it is larger than the sum of its proper divisors (1).

781838112113 is an equidigital number, since it uses as much as digits as its factorization.

781838112113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 44.

The spelling of 781838112113 in words is "seven hundred eighty-one billion, eight hundred thirty-eight million, one hundred twelve thousand, one hundred thirteen".