781838112131 has 8 divisors (see below), whose sum is σ = 824241705504. Its totient is φ = 740135404800.

The previous prime is 781838112113. The next prime is 781838112157. The reversal of 781838112131 is 131211838187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 781838112131 - 2¹⁸ = 781837849987 is a prime.

It is a super-2 number, since 2×781838112131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781838112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175219220 + ... + 175223681.

It is an arithmetic number, because the mean of its divisors is an integer number (103030213188).

Almost surely, 2^781838112131 is an apocalyptic number.

781838112131 is a deficient number, since it is larger than the sum of its proper divisors (42403593373).

781838112131 is a wasteful number, since it uses less digits than its factorization.

781838112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350443021.

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

The spelling of 781838112131 in words is "seven hundred eighty-one billion, eight hundred thirty-eight million, one hundred twelve thousand, one hundred thirty-one".