81194276107 has 24 divisors (see below), whose sum is σ = 102628746240. Its totient is φ = 63805326480.

The previous prime is 81194276101. The next prime is 81194276123. The reversal of 81194276107 is 70167249118.

It is a happy number.

It is not a de Polignac number, because 81194276107 - 2³ = 81194276099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81194276101) 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 23 ways as a sum of consecutive naturals, for example, 1377783 + ... + 1435504.

It is an arithmetic number, because the mean of its divisors is an integer number (4276197760).

Almost surely, 2^81194276107 is an apocalyptic number.

81194276107 is a deficient number, since it is larger than the sum of its proper divisors (21434470133).

81194276107 is a wasteful number, since it uses less digits than its factorization.

81194276107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813351 (or 2813344 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 81194276107 in words is "eighty-one billion, one hundred ninety-four million, two hundred seventy-six thousand, one hundred seven".