64843949 has 2 divisors, whose sum is σ = 64843950. Its totient is φ = 64843948.

The previous prime is 64843939. The next prime is 64843981. The reversal of 64843949 is 94934846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 8743849 = 7490^2 + 2957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64843949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64843939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421974 + 32421975.

It is an arithmetic number, because the mean of its divisors is an integer number (32421975).

Almost surely, 2^64843949 is an apocalyptic number.

It is an amenable number.

64843949 is a deficient number, since it is larger than the sum of its proper divisors (1).

64843949 is an equidigital number, since it uses as much as digits as its factorization.

64843949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 47.

The square root of 64843949 is about 8052.5740605101. The cubic root of 64843949 is about 401.7505548021.

The spelling of 64843949 in words is "sixty-four million, eight hundred forty-three thousand, nine hundred forty-nine".