761211221 has 2 divisors, whose sum is σ = 761211222. Its totient is φ = 761211220.

The previous prime is 761211211. The next prime is 761211251. The reversal of 761211221 is 122112167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 534256996 + 226954225 = 23114^2 + 15065^2 .

It is an emirp because it is prime and its reverse (122112167) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-761211221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (761211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380605610 + 380605611.

It is an arithmetic number, because the mean of its divisors is an integer number (380605611).

Almost surely, 2^761211221 is an apocalyptic number.

It is an amenable number.

761211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

761211221 is an equidigital number, since it uses as much as digits as its factorization.

761211221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 23.

The square root of 761211221 is about 27590.0565602900. The cubic root of 761211221 is about 913.0650665607.

Adding to 761211221 its reverse (122112167), we get a palindrome (883323388).

The spelling of 761211221 in words is "seven hundred sixty-one million, two hundred eleven thousand, two hundred twenty-one".