5281661 has 24 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 3998400.

The previous prime is 5281657. The next prime is 5281663. The reversal of 5281661 is 1661825.

It is a happy number.

It is not a de Polignac number, because 5281661 - 2² = 5281657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5281663) 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 23 ways as a sum of consecutive naturals, for example, 21980 + ... + 22218.

It is an arithmetic number, because the mean of its divisors is an integer number (287280).

Almost surely, 2^5281661 is an apocalyptic number.

It is an amenable number.

5281661 is a deficient number, since it is larger than the sum of its proper divisors (1613059).

5281661 is a wasteful number, since it uses less digits than its factorization.

5281661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 298 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 5281661 is about 2298.1864589280. The cubic root of 5281661 is about 174.1500115583.

The spelling of 5281661 in words is "five million, two hundred eighty-one thousand, six hundred sixty-one".