64857971 has 2 divisors, whose sum is σ = 64857972. Its totient is φ = 64857970.

The previous prime is 64857959. The next prime is 64858019. The reversal of 64857971 is 17975846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64857971 - 2¹⁸ = 64595827 is a prime.

It is not a weakly prime, because it can be changed into another prime (64857271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428985 + 32428986.

It is an arithmetic number, because the mean of its divisors is an integer number (32428986).

Almost surely, 2^64857971 is an apocalyptic number.

64857971 is a deficient number, since it is larger than the sum of its proper divisors (1).

64857971 is an equidigital number, since it uses as much as digits as its factorization.

64857971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 64857971 is about 8053.4446667249. Note that the first 3 decimals coincide. The cubic root of 64857971 is about 401.7795111933.

The spelling of 64857971 in words is "sixty-four million, eight hundred fifty-seven thousand, nine hundred seventy-one".