750721 has 2 divisors, whose sum is σ = 750722.
Its totient is φ = 750720.
The previous prime is 750719. The next prime is 750749. The reversal of 750721 is 127057.
Adding to 750721 its reverse (127057), we get a palindrome (877778).
750721 is nontrivially palindromic in base 5.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 746496 + 4225 = 864^2 + 65^2
It is a cyclic number.
It is not a de Polignac number, because 750721 - 21 = 750719 is a prime.
Together with 750719, it forms a pair of twin primes.
It is a junction number, because it is equal to n+sod(n) for n = 750692 and 750701.
It is not a weakly prime, because it can be changed into another prime (750791) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 375360 + 375361.
It is an arithmetic number, because the mean of its divisors is an integer number (375361).
2750721 is an apocalyptic number.
It is an amenable number.
750721 is a deficient number, since it is larger than the sum of its proper divisors (1).
750721 is an equidigital number, since it uses as much as digits as its factorization.
750721 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 490, while the sum is 22.
The square root of 750721 is about 866.4415733331.
The cubic root of 750721 is about 90.8851346270.
The spelling of 750721 in words is "seven hundred fifty thousand, seven hundred twenty-one".