721201365 has 24 divisors (see below), whose sum is σ = 1262227200. Its totient is φ = 380903904.

The previous prime is 721201343. The next prime is 721201399. The reversal of 721201365 is 563102127.

It is a happy number.

It is not a de Polignac number, because 721201365 - 2⁶ = 721201301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73165 + ... + 82434.

It is an arithmetic number, because the mean of its divisors is an integer number (52592800).

Almost surely, 2^721201365 is an apocalyptic number.

It is an amenable number.

721201365 is a deficient number, since it is larger than the sum of its proper divisors (541025835).

721201365 is a wasteful number, since it uses less digits than its factorization.

721201365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155713 (or 155710 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 721201365 is about 26855.1925146702. The cubic root of 721201365 is about 896.7791725690.

The spelling of 721201365 in words is "seven hundred twenty-one million, two hundred one thousand, three hundred sixty-five".