721315267 has 4 divisors (see below), whose sum is σ = 730445920. Its totient is φ = 712184616.

The previous prime is 721315237. The next prime is 721315279. The reversal of 721315267 is 762513127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 762513127 = 1423 ⋅535849.

It is a cyclic number.

It is not a de Polignac number, because 721315267 - 2⁷ = 721315139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721315237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4565208 + ... + 4565365.

It is an arithmetic number, because the mean of its divisors is an integer number (182611480).

Almost surely, 2^721315267 is an apocalyptic number.

721315267 is a deficient number, since it is larger than the sum of its proper divisors (9130653).

721315267 is an equidigital number, since it uses as much as digits as its factorization.

721315267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130652.

The product of its digits is 17640, while the sum is 34.

The square root of 721315267 is about 26857.3131009042. The cubic root of 721315267 is about 896.8263806348.

The spelling of 721315267 in words is "seven hundred twenty-one million, three hundred fifteen thousand, two hundred sixty-seven".