91000910051 has 4 divisors (see below), whose sum is σ = 91124051400. Its totient is φ = 90877768704.

The previous prime is 91000910041. The next prime is 91000910083. The reversal of 91000910051 is 15001900019.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91000910051 - 2²⁶ = 90933801187 is a prime.

It is a super-3 number, since 3×91000910051³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91000910051.

It is not an unprimeable number, because it can be changed into a prime (91000910041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61569566 + ... + 61571043.

It is an arithmetic number, because the mean of its divisors is an integer number (22781012850).

Almost surely, 2^91000910051 is an apocalyptic number.

91000910051 is a deficient number, since it is larger than the sum of its proper divisors (123141349).

91000910051 is a wasteful number, since it uses less digits than its factorization.

91000910051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123141348.

The product of its (nonzero) digits is 405, while the sum is 26.

The spelling of 91000910051 in words is "ninety-one billion, nine hundred ten thousand, fifty-one".