4991761 has 4 divisors (see below), whose sum is σ = 5285412. Its totient is φ = 4698112.

The previous prime is 4991719. The next prime is 4991771. The reversal of 4991761 is 1671994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1671994 = 2 ⋅835997.

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 891136 = 2025^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991761 - 2⁹ = 4991249 is a prime.

It is a super-2 number, since 2×4991761² = 49835355762242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4991761.

It is not an unprimeable number, because it can be changed into a prime (4991771) 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, 146800 + ... + 146833.

It is an arithmetic number, because the mean of its divisors is an integer number (1321353).

Almost surely, 2^4991761 is an apocalyptic number.

It is an amenable number.

4991761 is a deficient number, since it is larger than the sum of its proper divisors (293651).

4991761 is a wasteful number, since it uses less digits than its factorization.

4991761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293650.

The product of its digits is 13608, while the sum is 37.

The square root of 4991761 is about 2234.2249215332. The cubic root of 4991761 is about 170.9036197526.

The spelling of 4991761 in words is "four million, nine hundred ninety-one thousand, seven hundred sixty-one".