965356721 has 4 divisors (see below), whose sum is σ = 1103264832. Its totient is φ = 827448612.

The previous prime is 965356699. The next prime is 965356729. The reversal of 965356721 is 127653569.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127653569 = 139 ⋅918371.

It is a cyclic number.

It is not a de Polignac number, because 965356721 - 2¹⁰ = 965355697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (965356729) 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, 68954045 + ... + 68954058.

It is an arithmetic number, because the mean of its divisors is an integer number (275816208).

Almost surely, 2^965356721 is an apocalyptic number.

It is an amenable number.

965356721 is a deficient number, since it is larger than the sum of its proper divisors (137908111).

965356721 is a wasteful number, since it uses less digits than its factorization.

965356721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137908110.

The product of its digits is 340200, while the sum is 44.

The square root of 965356721 is about 31070.1902311524. The cubic root of 965356721 is about 988.3162622536.

The spelling of 965356721 in words is "nine hundred sixty-five million, three hundred fifty-six thousand, seven hundred twenty-one".