64812871 has 2 divisors, whose sum is σ = 64812872. Its totient is φ = 64812870.

The previous prime is 64812829. The next prime is 64812877. The reversal of 64812871 is 17821846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64812871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64812871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64812877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406435 + 32406436.

It is an arithmetic number, because the mean of its divisors is an integer number (32406436).

Almost surely, 2^64812871 is an apocalyptic number.

64812871 is a deficient number, since it is larger than the sum of its proper divisors (1).

64812871 is an equidigital number, since it uses as much as digits as its factorization.

64812871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 64812871 is about 8050.6441357198. The cubic root of 64812871 is about 401.6863617193.

Subtracting from 64812871 its reverse (17821846), we obtain a square (46991025 = 6855²).

The spelling of 64812871 in words is "sixty-four million, eight hundred twelve thousand, eight hundred seventy-one".