646201511 has 2 divisors, whose sum is σ = 646201512. Its totient is φ = 646201510.

The previous prime is 646201483. The next prime is 646201513. The reversal of 646201511 is 115102646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646201511 is a prime.

Together with 646201513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646201513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323100755 + 323100756.

It is an arithmetic number, because the mean of its divisors is an integer number (323100756).

Almost surely, 2^646201511 is an apocalyptic number.

646201511 is a deficient number, since it is larger than the sum of its proper divisors (1).

646201511 is an equidigital number, since it uses as much as digits as its factorization.

646201511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 646201511 is about 25420.4939173101. The cubic root of 646201511 is about 864.5484232308.

The spelling of 646201511 in words is "six hundred forty-six million, two hundred one thousand, five hundred eleven".