64861933 has 2 divisors, whose sum is σ = 64861934. Its totient is φ = 64861932.

The previous prime is 64861921. The next prime is 64861939. The reversal of 64861933 is 33916846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53042089 + 11819844 = 7283^2 + 3438^2 .

It is a cyclic number.

It is not a de Polignac number, because 64861933 - 2¹³ = 64853741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64861939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32430966 + 32430967.

It is an arithmetic number, because the mean of its divisors is an integer number (32430967).

Almost surely, 2^64861933 is an apocalyptic number.

It is an amenable number.

64861933 is a deficient number, since it is larger than the sum of its proper divisors (1).

64861933 is an equidigital number, since it uses as much as digits as its factorization.

64861933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 64861933 is about 8053.6906446672. The cubic root of 64861933 is about 401.7876922387.

The spelling of 64861933 in words is "sixty-four million, eight hundred sixty-one thousand, nine hundred thirty-three".