500000091 has 8 divisors (see below), whose sum is σ = 666792000. Its totient is φ = 333270792.

The previous prime is 500000089. The next prime is 500000093. The reversal of 500000091 is 190000005.

It is an interprime number because it is at equal distance from previous prime (500000089) and next prime (500000093).

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

It is not a de Polignac number, because 500000091 - 2¹ = 500000089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 500000091.

It is not an unprimeable number, because it can be changed into a prime (500000093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8160 + ... + 32658.

It is an arithmetic number, because the mean of its divisors is an integer number (83349000).

Almost surely, 2^500000091 is an apocalyptic number.

500000091 is a deficient number, since it is larger than the sum of its proper divisors (166791909).

500000091 is a wasteful number, since it uses less digits than its factorization.

500000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31305.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 500000091 is about 22360.6818098197. The cubic root of 500000091 is about 793.7005741353.

Adding to 500000091 its reverse (190000005), we get a palindrome (690000096).

The spelling of 500000091 in words is "five hundred million, ninety-one", and thus it is an aban number.