613221255 has 12 divisors (see below), whose sum is σ = 1062916920. Its totient is φ = 327051312.

The previous prime is 613221253. The next prime is 613221299. The reversal of 613221255 is 552122316.

It is a happy number.

613221255 is a `hidden beast` number, since 613 + 2 + 21 + 25 + 5 = 666.

It is not a de Polignac number, because 613221255 - 2¹ = 613221253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613221253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6813525 + ... + 6813614.

It is an arithmetic number, because the mean of its divisors is an integer number (88576410).

Almost surely, 2^613221255 is an apocalyptic number.

613221255 is a deficient number, since it is larger than the sum of its proper divisors (449695665).

613221255 is a wasteful number, since it uses less digits than its factorization.

613221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13627150 (or 13627147 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 613221255 is about 24763.3046058074. The cubic root of 613221255 is about 849.5828425932.

The spelling of 613221255 in words is "six hundred thirteen million, two hundred twenty-one thousand, two hundred fifty-five".