91007123 has 4 divisors (see below), whose sum is σ = 91100688. Its totient is φ = 90913560.

The previous prime is 91007101. The next prime is 91007153. The reversal of 91007123 is 32170019.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91007123 - 2²² = 86812819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91007153) 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, 45308 + ... + 47273.

It is an arithmetic number, because the mean of its divisors is an integer number (22775172).

Almost surely, 2^91007123 is an apocalyptic number.

91007123 is a deficient number, since it is larger than the sum of its proper divisors (93565).

91007123 is an equidigital number, since it uses as much as digits as its factorization.

91007123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93564.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 91007123 is about 9539.7653535084. The cubic root of 91007123 is about 449.8058800590.

The spelling of 91007123 in words is "ninety-one million, seven thousand, one hundred twenty-three".