965243821 has 2 divisors, whose sum is σ = 965243822. Its totient is φ = 965243820.

The previous prime is 965243819. The next prime is 965243831. The reversal of 965243821 is 128342569.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752404900 + 212838921 = 27430^2 + 14589^2 .

It is an emirp because it is prime and its reverse (128342569) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 965243821 - 2¹ = 965243819 is a prime.

Together with 965243819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (965243831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482621910 + 482621911.

It is an arithmetic number, because the mean of its divisors is an integer number (482621911).

Almost surely, 2^965243821 is an apocalyptic number.

It is an amenable number.

965243821 is a deficient number, since it is larger than the sum of its proper divisors (1).

965243821 is an equidigital number, since it uses as much as digits as its factorization.

965243821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 965243821 is about 31068.3733240091. The cubic root of 965243821 is about 988.2777323666.

The spelling of 965243821 in words is "nine hundred sixty-five million, two hundred forty-three thousand, eight hundred twenty-one".