64560961 has 2 divisors, whose sum is σ = 64560962. Its totient is φ = 64560960.

The previous prime is 64560959. The next prime is 64560971. The reversal of 64560961 is 16906546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 2702736 = 7865^2 + 1644^2 .

It is a cyclic number.

It is not a de Polignac number, because 64560961 - 2¹ = 64560959 is a prime.

Together with 64560959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64560961.

It is not a weakly prime, because it can be changed into another prime (64560971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32280480 + 32280481.

It is an arithmetic number, because the mean of its divisors is an integer number (32280481).

Almost surely, 2^64560961 is an apocalyptic number.

It is an amenable number.

64560961 is a deficient number, since it is larger than the sum of its proper divisors (1).

64560961 is an equidigital number, since it uses as much as digits as its factorization.

64560961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 64560961 is about 8034.9835718563. The cubic root of 64560961 is about 401.1652708134.

The spelling of 64560961 in words is "sixty-four million, five hundred sixty thousand, nine hundred sixty-one".