761188721 has 2 divisors, whose sum is σ = 761188722. Its totient is φ = 761188720.

The previous prime is 761188711. The next prime is 761188741. The reversal of 761188721 is 127881167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709636321 + 51552400 = 26639^2 + 7180^2 .

It is an emirp because it is prime and its reverse (127881167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 761188721 - 2¹⁰ = 761187697 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (761188711) 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, 380594360 + 380594361.

It is an arithmetic number, because the mean of its divisors is an integer number (380594361).

Almost surely, 2^761188721 is an apocalyptic number.

It is an amenable number.

761188721 is a deficient number, since it is larger than the sum of its proper divisors (1).

761188721 is an equidigital number, since it uses as much as digits as its factorization.

761188721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 41.

The square root of 761188721 is about 27589.6488016792. The cubic root of 761188721 is about 913.0560702988.

The spelling of 761188721 in words is "seven hundred sixty-one million, one hundred eighty-eight thousand, seven hundred twenty-one".