64441961 has 2 divisors, whose sum is σ = 64441962. Its totient is φ = 64441960.

The previous prime is 64441933. The next prime is 64441967. The reversal of 64441961 is 16914446.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 25441936 = 6245^2 + 5044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64441961 is a prime.

It is not a weakly prime, because it can be changed into another prime (64441967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220980 + 32220981.

It is an arithmetic number, because the mean of its divisors is an integer number (32220981).

Almost surely, 2^64441961 is an apocalyptic number.

It is an amenable number.

64441961 is a deficient number, since it is larger than the sum of its proper divisors (1).

64441961 is an equidigital number, since it uses as much as digits as its factorization.

64441961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 64441961 is about 8027.5750385780. The cubic root of 64441961 is about 400.9186407163.

The spelling of 64441961 in words is "sixty-four million, four hundred forty-one thousand, nine hundred sixty-one".