721313355 has 32 divisors (see below), whose sum is σ = 1320827904. Its totient is φ = 329279616.

The previous prime is 721313339. The next prime is 721313377. The reversal of 721313355 is 553313127.

It is not a de Polignac number, because 721313355 - 2⁴ = 721313339 is a prime.

It is a super-2 number, since 2×721313355² = 1040585912202712050, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 76722 + ... + 85608.

It is an arithmetic number, because the mean of its divisors is an integer number (41275872).

Almost surely, 2^721313355 is an apocalyptic number.

721313355 is a deficient number, since it is larger than the sum of its proper divisors (599514549).

721313355 is a wasteful number, since it uses less digits than its factorization.

721313355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9675.

The product of its digits is 9450, while the sum is 30.

The square root of 721313355 is about 26857.2775053616. The cubic root of 721313355 is about 896.8255882242.

The spelling of 721313355 in words is "seven hundred twenty-one million, three hundred thirteen thousand, three hundred fifty-five".