91000501 has 4 divisors (see below), whose sum is σ = 93460012. Its totient is φ = 88540992.

The previous prime is 91000499. The next prime is 91000517. The reversal of 91000501 is 10500019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10500019 = 2887 ⋅3637.

It can be written as a sum of positive squares in 2 ways, for example, as 61308900 + 29691601 = 7830^2 + 5449^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000501 - 2¹ = 91000499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91006501) 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, 1229700 + ... + 1229773.

It is an arithmetic number, because the mean of its divisors is an integer number (23365003).

Almost surely, 2^91000501 is an apocalyptic number.

It is an amenable number.

91000501 is a deficient number, since it is larger than the sum of its proper divisors (2459511).

91000501 is a wasteful number, since it uses less digits than its factorization.

91000501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459510.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 91000501 is about 9539.4182736685. The cubic root of 91000501 is about 449.7949699724.

The spelling of 91000501 in words is "ninety-one million, five hundred one", and thus it is an aban number.