649810111 has 2 divisors, whose sum is σ = 649810112. Its totient is φ = 649810110.

The previous prime is 649810103. The next prime is 649810121. The reversal of 649810111 is 111018946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649810111 - 2³ = 649810103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649810121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324905055 + 324905056.

It is an arithmetic number, because the mean of its divisors is an integer number (324905056).

Almost surely, 2^649810111 is an apocalyptic number.

649810111 is a deficient number, since it is larger than the sum of its proper divisors (1).

649810111 is an equidigital number, since it uses as much as digits as its factorization.

649810111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 649810111 is about 25491.3732662640. The cubic root of 649810111 is about 866.1547436497.

The spelling of 649810111 in words is "six hundred forty-nine million, eight hundred ten thousand, one hundred eleven".