71109278091 has 24 divisors (see below), whose sum is σ = 103089930944. Its totient is φ = 47232532080.

The previous prime is 71109278057. The next prime is 71109278137. The reversal of 71109278091 is 19087290117.

It is a happy number.

It is not a de Polignac number, because 71109278091 - 2¹³ = 71109269899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71109278041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10858080 + ... + 10864626.

Almost surely, 2^71109278091 is an apocalyptic number.

71109278091 is a deficient number, since it is larger than the sum of its proper divisors (31980652853).

71109278091 is a wasteful number, since it uses less digits than its factorization.

71109278091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10791 (or 10788 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 45.

The spelling of 71109278091 in words is "seventy-one billion, one hundred nine million, two hundred seventy-eight thousand, ninety-one".