721411597 has 2 divisors, whose sum is σ = 721411598. Its totient is φ = 721411596.

The previous prime is 721411591. The next prime is 721411651. The reversal of 721411597 is 795114127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717918436 + 3493161 = 26794^2 + 1869^2 .

It is a cyclic number.

It is not a de Polignac number, because 721411597 - 2¹⁵ = 721378829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721411591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360705798 + 360705799.

It is an arithmetic number, because the mean of its divisors is an integer number (360705799).

Almost surely, 2^721411597 is an apocalyptic number.

It is an amenable number.

721411597 is a deficient number, since it is larger than the sum of its proper divisors (1).

721411597 is an equidigital number, since it uses as much as digits as its factorization.

721411597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 721411597 is about 26859.1064073249. The cubic root of 721411597 is about 896.8663018933.

The spelling of 721411597 in words is "seven hundred twenty-one million, four hundred eleven thousand, five hundred ninety-seven".