655215 has 36 divisors (see below), whose sum is σ = 1216152. Its totient is φ = 300960.

The previous prime is 655211. The next prime is 655219. The reversal of 655215 is 512556.

It is an interprime number because it is at equal distance from previous prime (655211) and next prime (655219).

It is not a de Polignac number, because 655215 - 2² = 655211 is a prime.

655215 is a lucky number.

It is a congruent 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 35 ways as a sum of consecutive naturals, for example, 34476 + ... + 34494.

It is an arithmetic number, because the mean of its divisors is an integer number (33782).

2⁶⁵⁵²¹⁵ is an apocalyptic number.

655215 is a deficient number, since it is larger than the sum of its proper divisors (560937).

655215 is a wasteful number, since it uses less digits than its factorization.

655215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 38 counting only the distinct ones).

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

The square root of 655215 is about 809.4535193574. The cubic root of 655215 is about 86.8549571623.

Multiplying 655215 by its product of digits (1500), we get a square (982822500 = 31350²).

The spelling of 655215 in words is "six hundred fifty-five thousand, two hundred fifteen".