721037 has 2 divisors, whose sum is σ = 721038. Its totient is φ = 721036.

The previous prime is 721013. The next prime is 721043. The reversal of 721037 is 730127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 90601 = 794^2 + 301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360518 + 360519.

It is an arithmetic number, because the mean of its divisors is an integer number (360519).

2⁷²¹⁰³⁷ is an apocalyptic number.

It is an amenable number.

721037 is a deficient number, since it is larger than the sum of its proper divisors (1).

721037 is an equidigital number, since it uses as much as digits as its factorization.

721037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 721037 is about 849.1389756689. The cubic root of 721037 is about 89.6711040738.

The spelling of 721037 in words is "seven hundred twenty-one thousand, thirty-seven".