4991081 has 8 divisors (see below), whose sum is σ = 5372424. Its totient is φ = 4619520.

The previous prime is 4991033. The next prime is 4991101. The reversal of 4991081 is 1801994.

It can be written as a sum of positive squares in 4 ways, for example, as 648025 + 4343056 = 805^2 + 2084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4991081 - 2²² = 796777 is a prime.

It is a super-2 number, since 2×4991081² = 49821779097122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370 + ... + 3443.

It is an arithmetic number, because the mean of its divisors is an integer number (671553).

Almost surely, 2^4991081 is an apocalyptic number.

It is an amenable number.

4991081 is a deficient number, since it is larger than the sum of its proper divisors (381343).

4991081 is a wasteful number, since it uses less digits than its factorization.

4991081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 4991081 is about 2234.0727382966. The cubic root of 4991081 is about 170.8958589818.

The spelling of 4991081 in words is "four million, nine hundred ninety-one thousand, eighty-one".