649857127 has 2 divisors, whose sum is σ = 649857128. Its totient is φ = 649857126.

The previous prime is 649857121. The next prime is 649857161. The reversal of 649857127 is 721758946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649857127 is a prime.

It is a super-3 number, since 3×649857127³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649857121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324928563 + 324928564.

It is an arithmetic number, because the mean of its divisors is an integer number (324928564).

Almost surely, 2^649857127 is an apocalyptic number.

649857127 is a deficient number, since it is larger than the sum of its proper divisors (1).

649857127 is an equidigital number, since it uses as much as digits as its factorization.

649857127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 649857127 is about 25492.2954439180. The cubic root of 649857127 is about 866.1756329057.

The spelling of 649857127 in words is "six hundred forty-nine million, eight hundred fifty-seven thousand, one hundred twenty-seven".