91003057 has 4 divisors (see below), whose sum is σ = 96356196. Its totient is φ = 85649920.

The previous prime is 91003051. The next prime is 91003061. The reversal of 91003057 is 75030019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75030019 = 8647 ⋅8677.

It can be written as a sum of positive squares in 2 ways, for example, as 27625536 + 63377521 = 5256^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 91003057 - 2¹⁵ = 90970289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91003051) 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, 2676544 + ... + 2676577.

It is an arithmetic number, because the mean of its divisors is an integer number (24089049).

Almost surely, 2^91003057 is an apocalyptic number.

It is an amenable number.

91003057 is a deficient number, since it is larger than the sum of its proper divisors (5353139).

91003057 is a wasteful number, since it uses less digits than its factorization.

91003057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353138.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 91003057 is about 9539.5522431611. The cubic root of 91003057 is about 449.7991811770.

The spelling of 91003057 in words is "ninety-one million, three thousand, fifty-seven".