4991365 has 4 divisors (see below), whose sum is σ = 5989644. Its totient is φ = 3993088.

The previous prime is 4991359. The next prime is 4991383. The reversal of 4991365 is 5631994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5631994 = 2 ⋅2815997.

It can be written as a sum of positive squares in 2 ways, for example, as 669124 + 4322241 = 818^2 + 2079^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991365 - 2⁵ = 4991333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499132 + ... + 499141.

It is an arithmetic number, because the mean of its divisors is an integer number (1497411).

Almost surely, 2^4991365 is an apocalyptic number.

It is an amenable number.

4991365 is a deficient number, since it is larger than the sum of its proper divisors (998279).

4991365 is an equidigital number, since it uses as much as digits as its factorization.

4991365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998278.

The product of its digits is 29160, while the sum is 37.

The square root of 4991365 is about 2234.1362984384. The cubic root of 4991365 is about 170.8991003307.

It can be divided in two parts, 4991 and 365, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 4991365 in words is "four million, nine hundred ninety-one thousand, three hundred sixty-five".