965705721 has 4 divisors (see below), whose sum is σ = 1287607632. Its totient is φ = 643803812.

The previous prime is 965705681. The next prime is 965705729. The reversal of 965705721 is 127507569.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 965705721 - 2⁷ = 965705593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (965705729) 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, 160950951 + ... + 160950956.

It is an arithmetic number, because the mean of its divisors is an integer number (321901908).

Almost surely, 2^965705721 is an apocalyptic number.

It is an amenable number.

965705721 is a deficient number, since it is larger than the sum of its proper divisors (321901911).

965705721 is a wasteful number, since it uses less digits than its factorization.

965705721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321901910.

The product of its (nonzero) digits is 132300, while the sum is 42.

The square root of 965705721 is about 31075.8060394256. The cubic root of 965705721 is about 988.4353480486.

The spelling of 965705721 in words is "nine hundred sixty-five million, seven hundred five thousand, seven hundred twenty-one".