721314165 has 128 divisors (see below), whose sum is σ = 1456164864. Its totient is φ = 299520000.

The previous prime is 721314137. The next prime is 721314173. The reversal of 721314165 is 561413127.

It is not a de Polignac number, because 721314165 - 2⁶ = 721314101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4776840 + ... + 4776990.

It is an arithmetic number, because the mean of its divisors is an integer number (11376288).

Almost surely, 2^721314165 is an apocalyptic number.

It is an amenable number.

721314165 is an abundant number, since it is smaller than the sum of its proper divisors (734850699).

721314165 is a wasteful number, since it uses less digits than its factorization.

721314165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its digits is 5040, while the sum is 30.

The square root of 721314165 is about 26857.2925850690. The cubic root of 721314165 is about 896.8259239213.

The spelling of 721314165 in words is "seven hundred twenty-one million, three hundred fourteen thousand, one hundred sixty-five".