721315279 has 2 divisors, whose sum is σ = 721315280. Its totient is φ = 721315278.

The previous prime is 721315237. The next prime is 721315291. The reversal of 721315279 is 972513127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721315279 - 2¹⁷ = 721184207 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 (721312279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360657639 + 360657640.

It is an arithmetic number, because the mean of its divisors is an integer number (360657640).

Almost surely, 2^721315279 is an apocalyptic number.

721315279 is a deficient number, since it is larger than the sum of its proper divisors (1).

721315279 is an equidigital number, since it uses as much as digits as its factorization.

721315279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 37.

The square root of 721315279 is about 26857.3133243070. The cubic root of 721315279 is about 896.8263856081.

The spelling of 721315279 in words is "seven hundred twenty-one million, three hundred fifteen thousand, two hundred seventy-nine".