91010010005 has 4 divisors (see below), whose sum is σ = 109212012012. Its totient is φ = 72808008000.

The previous prime is 91010009971. The next prime is 91010010079. The reversal of 91010010005 is 50001001019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63927054244 + 27082955761 = 252838^2 + 164569^2 .

It is not a de Polignac number, because 91010010005 - 2²⁰ = 91008961429 is a prime.

It is a super-2 number, since 2×91010010005² (a number of 23 digits) 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 3 ways as a sum of consecutive naturals, for example, 9101000996 + ... + 9101001005.

It is an arithmetic number, because the mean of its divisors is an integer number (27303003003).

Almost surely, 2^91010010005 is an apocalyptic number.

It is an amenable number.

91010010005 is a deficient number, since it is larger than the sum of its proper divisors (18202002007).

91010010005 is a wasteful number, since it uses less digits than its factorization.

91010010005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18202002006.

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

The spelling of 91010010005 in words is "ninety-one billion, ten million, ten thousand, five".