965222721 has 12 divisors (see below), whose sum is σ = 1396052580. Its totient is φ = 642631680.

The previous prime is 965222707. The next prime is 965222729. The reversal of 965222721 is 127222569.

It is a happy number.

965222721 is a `hidden beast` number, since 96 + 522 + 27 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 150405696 + 814817025 = 12264^2 + 28545^2 .

It is not a de Polignac number, because 965222721 - 2²⁶ = 898113857 is a prime.

It is a super-2 number, since 2×965222721² = 1863309802269287682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (965222729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63616 + ... + 77313.

It is an arithmetic number, because the mean of its divisors is an integer number (116337715).

Almost surely, 2^965222721 is an apocalyptic number.

It is an amenable number.

965222721 is a deficient number, since it is larger than the sum of its proper divisors (430829859).

965222721 is a wasteful number, since it uses less digits than its factorization.

965222721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141696 (or 141693 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 965222721 is about 31068.0337485332. The cubic root of 965222721 is about 988.2705311421.

The spelling of 965222721 in words is "nine hundred sixty-five million, two hundred twenty-two thousand, seven hundred twenty-one".