655801 has 4 divisors (see below), whose sum is σ = 662272. Its totient is φ = 649332.

The previous prime is 655757. The next prime is 655807. The reversal of 655801 is 108556.

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 655801 - 2⁹ = 655289 is a prime.

It is a Duffinian number.

655801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (655807) 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, 3081 + ... + 3286.

It is an arithmetic number, because the mean of its divisors is an integer number (165568).

2⁶⁵⁵⁸⁰¹ is an apocalyptic number.

It is an amenable number.

655801 is a deficient number, since it is larger than the sum of its proper divisors (6471).

655801 is a wasteful number, since it uses less digits than its factorization.

655801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6470.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 655801 is about 809.8154110660. The cubic root of 655801 is about 86.8808427311.

The spelling of 655801 in words is "six hundred fifty-five thousand, eight hundred one".