721315275 has 24 divisors (see below), whose sum is σ = 1201296624. Its totient is φ = 381888000.

The previous prime is 721315237. The next prime is 721315279. The reversal of 721315275 is 572513127.

It is a happy number.

It is not a de Polignac number, because 721315275 - 2¹² = 721311179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721315279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24826 + ... + 45375.

It is an arithmetic number, because the mean of its divisors is an integer number (50054026).

Almost surely, 2^721315275 is an apocalyptic number.

721315275 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721315275 is a deficient number, since it is larger than the sum of its proper divisors (479981349).

721315275 is a wasteful number, since it uses less digits than its factorization.

721315275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70351 (or 70346 counting only the distinct ones).

The product of its digits is 14700, while the sum is 33.

The square root of 721315275 is about 26857.3132498394. The cubic root of 721315275 is about 896.8263839503.

The spelling of 721315275 in words is "seven hundred twenty-one million, three hundred fifteen thousand, two hundred seventy-five".