64135243 has 2 divisors, whose sum is σ = 64135244. Its totient is φ = 64135242.

The previous prime is 64135219. The next prime is 64135259. The reversal of 64135243 is 34253146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64135243 - 2²¹ = 62038091 is a prime.

It is a super-2 number, since 2×64135243² = 8226658789338098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64135283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32067621 + 32067622.

It is an arithmetic number, because the mean of its divisors is an integer number (32067622).

Almost surely, 2^64135243 is an apocalyptic number.

64135243 is a deficient number, since it is larger than the sum of its proper divisors (1).

64135243 is an equidigital number, since it uses as much as digits as its factorization.

64135243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

The square root of 64135243 is about 8008.4482267166. The cubic root of 64135243 is about 400.2815580162.

Adding to 64135243 its reverse (34253146), we get a palindrome (98388389).

The spelling of 64135243 in words is "sixty-four million, one hundred thirty-five thousand, two hundred forty-three".