909131128091 has 2 divisors, whose sum is σ = 909131128092. Its totient is φ = 909131128090.

The previous prime is 909131128057. The next prime is 909131128219. The reversal of 909131128091 is 190821131909.

909131128091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 909131128091 - 2¹⁸ = 909130865947 is a prime.

It is not a weakly prime, because it can be changed into another prime (909131128001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454565564045 + 454565564046.

It is an arithmetic number, because the mean of its divisors is an integer number (454565564046).

Almost surely, 2^909131128091 is an apocalyptic number.

909131128091 is a deficient number, since it is larger than the sum of its proper divisors (1).

909131128091 is an equidigital number, since it uses as much as digits as its factorization.

909131128091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 909131128091 in words is "nine hundred nine billion, one hundred thirty-one million, one hundred twenty-eight thousand, ninety-one".