81193120047 has 36 divisors (see below), whose sum is σ = 127029750120. Its totient is φ = 49951077696.

The previous prime is 81193120031. The next prime is 81193120049. The reversal of 81193120047 is 74002139118.

It is a happy number.

It is not a de Polignac number, because 81193120047 - 2⁴ = 81193120031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81193119993 and 81193120020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81193120049) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9202204 + ... + 9211022.

It is an arithmetic number, because the mean of its divisors is an integer number (3528604170).

Almost surely, 2^81193120047 is an apocalyptic number.

81193120047 is a deficient number, since it is larger than the sum of its proper divisors (45836630073).

81193120047 is a wasteful number, since it uses less digits than its factorization.

81193120047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14904 (or 14888 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 81193120047 in words is "eighty-one billion, one hundred ninety-three million, one hundred twenty thousand, forty-seven".