611435231221 has 2 divisors, whose sum is σ = 611435231222. Its totient is φ = 611435231220.

The previous prime is 611435231189. The next prime is 611435231279. The reversal of 611435231221 is 122132534116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556262388900 + 55172842321 = 745830^2 + 234889^2 .

It is a cyclic number.

It is not a de Polignac number, because 611435231221 - 2⁵ = 611435231189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611435231621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305717615610 + 305717615611.

It is an arithmetic number, because the mean of its divisors is an integer number (305717615611).

Almost surely, 2^611435231221 is an apocalyptic number.

It is an amenable number.

611435231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

611435231221 is an equidigital number, since it uses as much as digits as its factorization.

611435231221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

Adding to 611435231221 its reverse (122132534116), we get a palindrome (733567765337).

The spelling of 611435231221 in words is "six hundred eleven billion, four hundred thirty-five million, two hundred thirty-one thousand, two hundred twenty-one".