91273073 has 4 divisors (see below), whose sum is σ = 91330800. Its totient is φ = 91215348.

The previous prime is 91273069. The next prime is 91273087. The reversal of 91273073 is 37037219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91273073 - 2² = 91273069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91273573) 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, 26423 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (22832700).

Almost surely, 2^91273073 is an apocalyptic number.

It is an amenable number.

91273073 is a deficient number, since it is larger than the sum of its proper divisors (57727).

91273073 is a wasteful number, since it uses less digits than its factorization.

91273073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57726.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 91273073 is about 9553.6942069547. The cubic root of 91273073 is about 450.2436096607.

The spelling of 91273073 in words is "ninety-one million, two hundred seventy-three thousand, seventy-three".