4991281 has 8 divisors (see below), whose sum is σ = 5274720. Its totient is φ = 4709952.

The previous prime is 4991267. The next prime is 4991291. The reversal of 4991281 is 1821994.

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 4991281 - 2⁵ = 4991249 is a prime.

It is a super-2 number, since 2×4991281² = 49825772041922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991201) 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, 8121 + ... + 8713.

It is an arithmetic number, because the mean of its divisors is an integer number (659340).

Almost surely, 2^4991281 is an apocalyptic number.

It is an amenable number.

4991281 is a deficient number, since it is larger than the sum of its proper divisors (283439).

4991281 is a wasteful number, since it uses less digits than its factorization.

4991281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055.

The product of its digits is 5184, while the sum is 34.

The square root of 4991281 is about 2234.1174991482. The cubic root of 4991281 is about 170.8981416347.

The spelling of 4991281 in words is "four million, nine hundred ninety-one thousand, two hundred eighty-one".