91909091005 has 8 divisors (see below), whose sum is σ = 115086166272. Its totient is φ = 70330434768.

The previous prime is 91909090991. The next prime is 91909091033. The reversal of 91909091005 is 50019090919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91909091005 - 2⁷ = 91909090877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399604629 + ... + 399604858.

It is an arithmetic number, because the mean of its divisors is an integer number (14385770784).

Almost surely, 2^91909091005 is an apocalyptic number.

It is an amenable number.

91909091005 is a deficient number, since it is larger than the sum of its proper divisors (23177075267).

91909091005 is a wasteful number, since it uses less digits than its factorization.

91909091005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799209515.

The product of its (nonzero) digits is 32805, while the sum is 43.

The spelling of 91909091005 in words is "ninety-one billion, nine hundred nine million, ninety-one thousand, five".