613101221 has 2 divisors, whose sum is σ = 613101222. Its totient is φ = 613101220.

The previous prime is 613101197. The next prime is 613101227. The reversal of 613101221 is 122101316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398800900 + 214300321 = 19970^2 + 14639^2 .

It is a cyclic number.

It is not a de Polignac number, because 613101221 - 2¹⁰ = 613100197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 613101221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613101227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306550610 + 306550611.

It is an arithmetic number, because the mean of its divisors is an integer number (306550611).

Almost surely, 2^613101221 is an apocalyptic number.

It is an amenable number.

613101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

613101221 is an equidigital number, since it uses as much as digits as its factorization.

613101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 613101221 is about 24760.8808607448. The cubic root of 613101221 is about 849.5274055707.

Adding to 613101221 its reverse (122101316), we get a palindrome (735202537).

The spelling of 613101221 in words is "six hundred thirteen million, one hundred one thousand, two hundred twenty-one".