721272577 has 2 divisors, whose sum is σ = 721272578. Its totient is φ = 721272576.

The previous prime is 721272569. The next prime is 721272647. The reversal of 721272577 is 775272127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630813456 + 90459121 = 25116^2 + 9511^2 .

It is a cyclic number.

It is not a de Polignac number, because 721272577 - 2³ = 721272569 is a prime.

It is not a weakly prime, because it can be changed into another prime (721272527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360636288 + 360636289.

It is an arithmetic number, because the mean of its divisors is an integer number (360636289).

Almost surely, 2^721272577 is an apocalyptic number.

It is an amenable number.

721272577 is a deficient number, since it is larger than the sum of its proper divisors (1).

721272577 is an equidigital number, since it uses as much as digits as its factorization.

721272577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96040, while the sum is 40.

The square root of 721272577 is about 26856.5183335443. The cubic root of 721272577 is about 896.8086878287.

The spelling of 721272577 in words is "seven hundred twenty-one million, two hundred seventy-two thousand, five hundred seventy-seven".