91020192909 has 16 divisors (see below), whose sum is σ = 122026823424. Its totient is φ = 60347520000.

The previous prime is 91020192883. The next prime is 91020192937. The reversal of 91020192909 is 90929102019.

It is not a de Polignac number, because 91020192909 - 2⁹ = 91020192397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91020196909) 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 15 ways as a sum of consecutive naturals, for example, 459157 + ... + 626789.

It is an arithmetic number, because the mean of its divisors is an integer number (7626676464).

Almost surely, 2^91020192909 is an apocalyptic number.

It is an amenable number.

91020192909 is a deficient number, since it is larger than the sum of its proper divisors (31006630515).

91020192909 is a wasteful number, since it uses less digits than its factorization.

91020192909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168628.

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 91020192909 in words is "ninety-one billion, twenty million, one hundred ninety-two thousand, nine hundred nine".