724221037 has 2 divisors, whose sum is σ = 724221038. Its totient is φ = 724221036.

The previous prime is 724221013. The next prime is 724221133. The reversal of 724221037 is 730122427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483164361 + 241056676 = 21981^2 + 15526^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724221037 is a prime.

It is a super-2 number, since 2×724221037² = 1048992220866710738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 724220996 and 724221014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724221137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362110518 + 362110519.

It is an arithmetic number, because the mean of its divisors is an integer number (362110519).

Almost surely, 2^724221037 is an apocalyptic number.

It is an amenable number.

724221037 is a deficient number, since it is larger than the sum of its proper divisors (1).

724221037 is an equidigital number, since it uses as much as digits as its factorization.

724221037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 724221037 is about 26911.3551684043. The cubic root of 724221037 is about 898.0290353755.

The spelling of 724221037 in words is "seven hundred twenty-four million, two hundred twenty-one thousand, thirty-seven".