91000555 has 8 divisors (see below), whose sum is σ = 109256544. Its totient is φ = 72763200.

The previous prime is 91000549. The next prime is 91000573. The reversal of 91000555 is 55500019.

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

It is not a de Polignac number, because 91000555 - 2¹¹ = 90998507 is a prime.

It is a super-2 number, since 2×91000555² = 16562202020616050, which contains 22 as substring.

It is a Duffinian 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, 10695 + ... + 17215.

It is an arithmetic number, because the mean of its divisors is an integer number (13657068).

Almost surely, 2^91000555 is an apocalyptic number.

91000555 is a deficient number, since it is larger than the sum of its proper divisors (18255989).

91000555 is a wasteful number, since it uses less digits than its factorization.

91000555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9317.

The product of its (nonzero) digits is 1125, while the sum is 25.

The square root of 91000555 is about 9539.4211040293. The cubic root of 91000555 is about 449.7950589423.

The spelling of 91000555 in words is "ninety-one million, five hundred fifty-five", and thus it is an aban number.