655251 has 4 divisors (see below), whose sum is σ = 873672. Its totient is φ = 436832.

The previous prime is 655243. The next prime is 655261. The reversal of 655251 is 152556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655251 - 2³ = 655243 is a prime.

It is a super-3 number, since 3×655251³ = 844003663913334753, which contains 333 as substring.

It is a D-number.

655251 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (655211) 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, 109206 + ... + 109211.

It is an arithmetic number, because the mean of its divisors is an integer number (218418).

2⁶⁵⁵²⁵¹ is an apocalyptic number.

655251 is a deficient number, since it is larger than the sum of its proper divisors (218421).

655251 is a wasteful number, since it uses less digits than its factorization.

655251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218420.

The product of its digits is 1500, while the sum is 24.

The square root of 655251 is about 809.4757562769. The cubic root of 655251 is about 86.8565478468.

The spelling of 655251 in words is "six hundred fifty-five thousand, two hundred fifty-one".