649143647 has 2 divisors, whose sum is σ = 649143648. Its totient is φ = 649143646.

The previous prime is 649143617. The next prime is 649143653. The reversal of 649143647 is 746341946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649143647 - 2¹² = 649139551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649143598 and 649143607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649143617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324571823 + 324571824.

It is an arithmetic number, because the mean of its divisors is an integer number (324571824).

Almost surely, 2^649143647 is an apocalyptic number.

649143647 is a deficient number, since it is larger than the sum of its proper divisors (1).

649143647 is an equidigital number, since it uses as much as digits as its factorization.

649143647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 649143647 is about 25478.2975687152. The cubic root of 649143647 is about 865.8585245904.

The spelling of 649143647 in words is "six hundred forty-nine million, one hundred forty-three thousand, six hundred forty-seven".