721315327 has 2 divisors, whose sum is σ = 721315328. Its totient is φ = 721315326.

The previous prime is 721315291. The next prime is 721315349. The reversal of 721315327 is 723513127.

It is a strong prime.

It is an emirp because it is prime and its reverse (723513127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721315327 - 2¹¹ = 721313279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721315027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360657663 + 360657664.

It is an arithmetic number, because the mean of its divisors is an integer number (360657664).

Almost surely, 2^721315327 is an apocalyptic number.

721315327 is a deficient number, since it is larger than the sum of its proper divisors (1).

721315327 is an equidigital number, since it uses as much as digits as its factorization.

721315327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 31.

The square root of 721315327 is about 26857.3142179184. The cubic root of 721315327 is about 896.8264055012.

The spelling of 721315327 in words is "seven hundred twenty-one million, three hundred fifteen thousand, three hundred twenty-seven".