649707549 has 16 divisors (see below), whose sum is σ = 888499584. Its totient is φ = 422136000.

The previous prime is 649707533. The next prime is 649707551. The reversal of 649707549 is 945707946.

It is not a de Polignac number, because 649707549 - 2⁴ = 649707533 is a prime.

It is a super-3 number, since 3×649707549³ (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 (649707599) 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, 10479 + ... + 37539.

It is an arithmetic number, because the mean of its divisors is an integer number (55531224).

Almost surely, 2^649707549 is an apocalyptic number.

It is an amenable number.

649707549 is a deficient number, since it is larger than the sum of its proper divisors (238792035).

649707549 is a wasteful number, since it uses less digits than its factorization.

649707549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27268.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The square root of 649707549 is about 25489.3614867066. The cubic root of 649707549 is about 866.1091717534.

The spelling of 649707549 in words is "six hundred forty-nine million, seven hundred seven thousand, five hundred forty-nine".