64991279 has 2 divisors, whose sum is σ = 64991280. Its totient is φ = 64991278.

The previous prime is 64991231. The next prime is 64991287. The reversal of 64991279 is 97219946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64991279 - 2²⁴ = 48214063 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 (64991219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32495639 + 32495640.

It is an arithmetic number, because the mean of its divisors is an integer number (32495640).

Almost surely, 2^64991279 is an apocalyptic number.

64991279 is a deficient number, since it is larger than the sum of its proper divisors (1).

64991279 is an equidigital number, since it uses as much as digits as its factorization.

64991279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 64991279 is about 8061.7168766957. The cubic root of 64991279 is about 402.0545931319.

The spelling of 64991279 in words is "sixty-four million, nine hundred ninety-one thousand, two hundred seventy-nine".