736569721 has 2 divisors, whose sum is σ = 736569722. Its totient is φ = 736569720.

The previous prime is 736569719. The next prime is 736569763. The reversal of 736569721 is 127965637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551310400 + 185259321 = 23480^2 + 13611^2 .

It is an emirp because it is prime and its reverse (127965637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 736569721 - 2¹ = 736569719 is a prime.

Together with 736569719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (736069721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368284860 + 368284861.

It is an arithmetic number, because the mean of its divisors is an integer number (368284861).

Almost surely, 2^736569721 is an apocalyptic number.

It is an amenable number.

736569721 is a deficient number, since it is larger than the sum of its proper divisors (1).

736569721 is an equidigital number, since it uses as much as digits as its factorization.

736569721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The square root of 736569721 is about 27139.8179986528. The cubic root of 736569721 is about 903.1043911614.

The spelling of 736569721 in words is "seven hundred thirty-six million, five hundred sixty-nine thousand, seven hundred twenty-one".