781106781091 has 32 divisors (see below), whose sum is σ = 963780231680. Its totient is φ = 616466163456.

The previous prime is 781106781083. The next prime is 781106781107. The reversal of 781106781091 is 190187601187.

It is not a de Polignac number, because 781106781091 - 2³ = 781106781083 is a prime.

It is a super-2 number, since 2×781106781091² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781106781001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61512655 + ... + 61525351.

It is an arithmetic number, because the mean of its divisors is an integer number (30118132240).

Almost surely, 2^781106781091 is an apocalyptic number.

781106781091 is a deficient number, since it is larger than the sum of its proper divisors (182673450589).

781106781091 is a wasteful number, since it uses less digits than its factorization.

781106781091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14363.

The product of its (nonzero) digits is 169344, while the sum is 49.

The spelling of 781106781091 in words is "seven hundred eighty-one billion, one hundred six million, seven hundred eighty-one thousand, ninety-one".