721403701 has 2 divisors, whose sum is σ = 721403702. Its totient is φ = 721403700.

The previous prime is 721403693. The next prime is 721403707. The reversal of 721403701 is 107304127.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690323076 + 31080625 = 26274^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 721403701 - 2³ = 721403693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721403707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360701850 + 360701851.

It is an arithmetic number, because the mean of its divisors is an integer number (360701851).

Almost surely, 2^721403701 is an apocalyptic number.

It is an amenable number.

721403701 is a deficient number, since it is larger than the sum of its proper divisors (1).

721403701 is an equidigital number, since it uses as much as digits as its factorization.

721403701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 721403701 is about 26858.9594176692. The cubic root of 721403701 is about 896.8630297520.

Adding to 721403701 its reverse (107304127), we get a palindrome (828707828).

The spelling of 721403701 in words is "seven hundred twenty-one million, four hundred three thousand, seven hundred one".