965651521 has 2 divisors, whose sum is σ = 965651522. Its totient is φ = 965651520.

The previous prime is 965651507. The next prime is 965651539. The reversal of 965651521 is 125156569.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913248400 + 52403121 = 30220^2 + 7239^2 .

It is an emirp because it is prime and its reverse (125156569) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 965651521 - 2²³ = 957262913 is a prime.

It is a super-2 number, since 2×965651521² = 1864965720019226882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (965651591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482825760 + 482825761.

It is an arithmetic number, because the mean of its divisors is an integer number (482825761).

Almost surely, 2^965651521 is an apocalyptic number.

It is an amenable number.

965651521 is a deficient number, since it is larger than the sum of its proper divisors (1).

965651521 is an equidigital number, since it uses as much as digits as its factorization.

965651521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 40.

The square root of 965651521 is about 31074.9339661406. The cubic root of 965651521 is about 988.4168558044.

The spelling of 965651521 in words is "nine hundred sixty-five million, six hundred fifty-one thousand, five hundred twenty-one".