64509937 has 2 divisors, whose sum is σ = 64509938. Its totient is φ = 64509936.

The previous prime is 64509923. The next prime is 64509941. The reversal of 64509937 is 73990546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 1846881 = 7916^2 + 1359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64509937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64509893 and 64509902.

It is not a weakly prime, because it can be changed into another prime (64509967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32254968 + 32254969.

It is an arithmetic number, because the mean of its divisors is an integer number (32254969).

Almost surely, 2^64509937 is an apocalyptic number.

It is an amenable number.

64509937 is a deficient number, since it is larger than the sum of its proper divisors (1).

64509937 is an equidigital number, since it uses as much as digits as its factorization.

64509937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 64509937 is about 8031.8078288764. The cubic root of 64509937 is about 401.0595596054.

The spelling of 64509937 in words is "sixty-four million, five hundred nine thousand, nine hundred thirty-seven".