656281 has 4 divisors (see below), whose sum is σ = 664272. Its totient is φ = 648292.

The previous prime is 656273. The next prime is 656291. The reversal of 656281 is 182656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656281 - 2³ = 656273 is a prime.

It is a super-2 number, since 2×656281² = 861409501922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656221) 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, 3871 + ... + 4036.

It is an arithmetic number, because the mean of its divisors is an integer number (166068).

2⁶⁵⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

656281 is a deficient number, since it is larger than the sum of its proper divisors (7991).

656281 is an equidigital number, since it uses as much as digits as its factorization.

656281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990.

The product of its digits is 2880, while the sum is 28.

The square root of 656281 is about 810.1117206904. Note that the first 3 decimals coincide. The cubic root of 656281 is about 86.9020344413.

The spelling of 656281 in words is "six hundred fifty-six thousand, two hundred eighty-one".