649679111 has 2 divisors, whose sum is σ = 649679112. Its totient is φ = 649679110.

The previous prime is 649679099. The next prime is 649679117. The reversal of 649679111 is 111976946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649679111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649679117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324839555 + 324839556.

It is an arithmetic number, because the mean of its divisors is an integer number (324839556).

Almost surely, 2^649679111 is an apocalyptic number.

649679111 is a deficient number, since it is larger than the sum of its proper divisors (1).

649679111 is an equidigital number, since it uses as much as digits as its factorization.

649679111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 649679111 is about 25488.8036400299. The cubic root of 649679111 is about 866.0965349027.

The spelling of 649679111 in words is "six hundred forty-nine million, six hundred seventy-nine thousand, one hundred eleven".