649857143 has 16 divisors (see below), whose sum is σ = 725306400. Its totient is φ = 578121600.

The previous prime is 649857127. The next prime is 649857161. The reversal of 649857143 is 341758946.

649857143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 649857143 - 2⁴ = 649857127 is a prime.

It is a super-3 number, since 3×649857143³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649857163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263048 + ... + 265506.

It is an arithmetic number, because the mean of its divisors is an integer number (45331650).

Almost surely, 2^649857143 is an apocalyptic number.

649857143 is a deficient number, since it is larger than the sum of its proper divisors (75449257).

649857143 is a wasteful number, since it uses less digits than its factorization.

649857143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202.

The product of its digits is 725760, while the sum is 47.

The square root of 649857143 is about 25492.2957577383. The cubic root of 649857143 is about 866.1756400143.

The spelling of 649857143 in words is "six hundred forty-nine million, eight hundred fifty-seven thousand, one hundred forty-three".