64391263 has 2 divisors, whose sum is σ = 64391264. Its totient is φ = 64391262.

The previous prime is 64391227. The next prime is 64391311. The reversal of 64391263 is 36219346.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64391263 - 2¹⁷ = 64260191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64398263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32195631 + 32195632.

It is an arithmetic number, because the mean of its divisors is an integer number (32195632).

Almost surely, 2^64391263 is an apocalyptic number.

64391263 is a deficient number, since it is larger than the sum of its proper divisors (1).

64391263 is an equidigital number, since it uses as much as digits as its factorization.

64391263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 64391263 is about 8024.4166766189. The cubic root of 64391263 is about 400.8134757714.

The spelling of 64391263 in words is "sixty-four million, three hundred ninety-one thousand, two hundred sixty-three".