965721213 has 6 divisors (see below), whose sum is σ = 1394930654. Its totient is φ = 643814136.

The previous prime is 965721209. The next prime is 965721221. The reversal of 965721213 is 312127569.

It can be written as a sum of positive squares in only one way, i.e., 633679929 + 332041284 = 25173^2 + 18222^2 .

It is not a de Polignac number, because 965721213 - 2² = 965721209 is a prime.

It is a super-2 number, since 2×965721213² = 1865234922476382738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (965721203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53651170 + ... + 53651187.

Almost surely, 2^965721213 is an apocalyptic number.

It is an amenable number.

965721213 is a deficient number, since it is larger than the sum of its proper divisors (429209441).

965721213 is a wasteful number, since it uses less digits than its factorization.

965721213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107302363 (or 107302360 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 965721213 is about 31076.0552998607. The cubic root of 965721213 is about 988.4406335644.

The spelling of 965721213 in words is "nine hundred sixty-five million, seven hundred twenty-one thousand, two hundred thirteen".