91007873 has 4 divisors (see below), whose sum is σ = 99281328. Its totient is φ = 82734420.

The previous prime is 91007869. The next prime is 91007881. The reversal of 91007873 is 37870019.

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 91007873 - 2² = 91007869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91007843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4136711 + ... + 4136732.

It is an arithmetic number, because the mean of its divisors is an integer number (24820332).

Almost surely, 2^91007873 is an apocalyptic number.

It is an amenable number.

91007873 is a deficient number, since it is larger than the sum of its proper divisors (8273455).

91007873 is a wasteful number, since it uses less digits than its factorization.

91007873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273454.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 91007873 is about 9539.8046625704. The cubic root of 91007873 is about 449.8071156894.

The spelling of 91007873 in words is "ninety-one million, seven thousand, eight hundred seventy-three".