721312279 has 2 divisors, whose sum is σ = 721312280. Its totient is φ = 721312278.

The previous prime is 721312259. The next prime is 721312349. The reversal of 721312279 is 972213127.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721312279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721312259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360656139 + 360656140.

It is an arithmetic number, because the mean of its divisors is an integer number (360656140).

Almost surely, 2^721312279 is an apocalyptic number.

721312279 is a deficient number, since it is larger than the sum of its proper divisors (1).

721312279 is an equidigital number, since it uses as much as digits as its factorization.

721312279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 721312279 is about 26857.2574735396. The cubic root of 721312279 is about 896.8251422854.

The spelling of 721312279 in words is "seven hundred twenty-one million, three hundred twelve thousand, two hundred seventy-nine".