649863719 has 2 divisors, whose sum is σ = 649863720. Its totient is φ = 649863718.

The previous prime is 649863713. The next prime is 649863749. The reversal of 649863719 is 917368946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649863719 - 2⁴ = 649863703 is a prime.

It is a super-2 number, since 2×649863719² = 844645706545021922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649863713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324931859 + 324931860.

It is an arithmetic number, because the mean of its divisors is an integer number (324931860).

Almost surely, 2^649863719 is an apocalyptic number.

649863719 is a deficient number, since it is larger than the sum of its proper divisors (1).

649863719 is an equidigital number, since it uses as much as digits as its factorization.

649863719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 649863719 is about 25492.4247375568. The cubic root of 649863719 is about 866.1785616574.

The spelling of 649863719 in words is "six hundred forty-nine million, eight hundred sixty-three thousand, seven hundred nineteen".