909127779091 has 4 divisors (see below), whose sum is σ = 1039003176112. Its totient is φ = 779252382072.

The previous prime is 909127779083. The next prime is 909127779121. The reversal of 909127779091 is 190977721909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190977721909 = 13 ⋅14690593993.

It is a cyclic number.

It is not a de Polignac number, because 909127779091 - 2³ = 909127779083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909127779071) 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 3 ways as a sum of consecutive naturals, for example, 64937698500 + ... + 64937698513.

It is an arithmetic number, because the mean of its divisors is an integer number (259750794028).

Almost surely, 2^909127779091 is an apocalyptic number.

909127779091 is a deficient number, since it is larger than the sum of its proper divisors (129875397021).

909127779091 is a wasteful number, since it uses less digits than its factorization.

909127779091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129875397020.

The product of its (nonzero) digits is 4500846, while the sum is 61.

The spelling of 909127779091 in words is "nine hundred nine billion, one hundred twenty-seven million, seven hundred seventy-nine thousand, ninety-one".