91011005 has 8 divisors (see below), whose sum is σ = 111753312. Its totient is φ = 71115408.

The previous prime is 91010993. The next prime is 91011029. The reversal of 91011005 is 50011019.

It is a happy number.

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 91011005 - 2⁴ = 91010989 is a prime.

It is a super-2 number, since 2×91011005² = 16566006062220050, which contains 22 as substring.

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, 211439 + ... + 211868.

It is an arithmetic number, because the mean of its divisors is an integer number (13969164).

Almost surely, 2^91011005 is an apocalyptic number.

It is an amenable number.

91011005 is a deficient number, since it is larger than the sum of its proper divisors (20742307).

91011005 is a wasteful number, since it uses less digits than its factorization.

91011005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423355.

The product of its (nonzero) digits is 45, while the sum is 17.

The square root of 91011005 is about 9539.9688154627. The cubic root of 91011005 is about 449.8122756082.

The spelling of 91011005 in words is "ninety-one million, eleven thousand, five".