65435921 has 2 divisors, whose sum is σ = 65435922. Its totient is φ = 65435920.

The previous prime is 65435917. The next prime is 65435939. The reversal of 65435921 is 12953456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47458321 + 17977600 = 6889^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 65435921 - 2² = 65435917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65435971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32717960 + 32717961.

It is an arithmetic number, because the mean of its divisors is an integer number (32717961).

Almost surely, 2^65435921 is an apocalyptic number.

It is an amenable number.

65435921 is a deficient number, since it is larger than the sum of its proper divisors (1).

65435921 is an equidigital number, since it uses as much as digits as its factorization.

65435921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 65435921 is about 8089.2472455724. The cubic root of 65435921 is about 402.9694041346.

The spelling of 65435921 in words is "sixty-five million, four hundred thirty-five thousand, nine hundred twenty-one".