91080999 has 6 divisors (see below), whose sum is σ = 131561456. Its totient is φ = 60720660.

The previous prime is 91080953. The next prime is 91081021. The reversal of 91080999 is 99908019.

It is not a de Polignac number, because 91080999 - 2¹² = 91076903 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 (91080929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5060047 + ... + 5060064.

Almost surely, 2^91080999 is an apocalyptic number.

91080999 is a deficient number, since it is larger than the sum of its proper divisors (40480457).

91080999 is a wasteful number, since it uses less digits than its factorization.

91080999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10120117 (or 10120114 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 91080999 is about 9543.6365710352. The cubic root of 91080999 is about 449.9275587094.

The spelling of 91080999 in words is "ninety-one million, eighty thousand, nine hundred ninety-nine".