655213 has 6 divisors (see below), whose sum is σ = 709674. Its totient is φ = 604656.

The previous prime is 655211. The next prime is 655219. The reversal of 655213 is 312556.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10404 + 644809 = 102^2 + 803^2 .

It is not a de Polignac number, because 655213 - 2¹ = 655211 is a prime.

It is a Duffinian number.

655213 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 5 ways as a sum of consecutive naturals, for example, 1770 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (118279).

2⁶⁵⁵²¹³ is an apocalyptic number.

It is an amenable number.

655213 is a deficient number, since it is larger than the sum of its proper divisors (54461).

655213 is a wasteful number, since it uses less digits than its factorization.

655213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903 (or 3890 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 655213 is about 809.4522839550. The cubic root of 655213 is about 86.8548687892.

Adding to 655213 its reverse (312556), we get a palindrome (967769).

It can be divided in two parts, 655 and 213, that added together give a palindrome (868).

The spelling of 655213 in words is "six hundred fifty-five thousand, two hundred thirteen".