645715211 has 2 divisors, whose sum is σ = 645715212. Its totient is φ = 645715210.

The previous prime is 645715207. The next prime is 645715241. The reversal of 645715211 is 112517546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645715211 - 2² = 645715207 is a prime.

It is not a weakly prime, because it can be changed into another prime (645715201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322857605 + 322857606.

It is an arithmetic number, because the mean of its divisors is an integer number (322857606).

Almost surely, 2^645715211 is an apocalyptic number.

645715211 is a deficient number, since it is larger than the sum of its proper divisors (1).

645715211 is an equidigital number, since it uses as much as digits as its factorization.

645715211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 645715211 is about 25410.9270000132. The cubic root of 645715211 is about 864.3314963639.

The spelling of 645715211 in words is "six hundred forty-five million, seven hundred fifteen thousand, two hundred eleven".