772342721 has 2 divisors, whose sum is σ = 772342722. Its totient is φ = 772342720.

The previous prime is 772342693. The next prime is 772342729. The reversal of 772342721 is 127243277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554367025 + 217975696 = 23545^2 + 14764^2 .

It is a cyclic number.

It is not a de Polignac number, because 772342721 - 2²⁶ = 705233857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (772342729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386171360 + 386171361.

It is an arithmetic number, because the mean of its divisors is an integer number (386171361).

Almost surely, 2^772342721 is an apocalyptic number.

It is an amenable number.

772342721 is a deficient number, since it is larger than the sum of its proper divisors (1).

772342721 is an equidigital number, since it uses as much as digits as its factorization.

772342721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 35.

The square root of 772342721 is about 27791.0546939119. The cubic root of 772342721 is about 917.4942530458.

Adding to 772342721 its reverse (127243277), we get a palindrome (899585998).

The spelling of 772342721 in words is "seven hundred seventy-two million, three hundred forty-two thousand, seven hundred twenty-one".