649760549 has 4 divisors (see below), whose sum is σ = 662020236. Its totient is φ = 637500864.

The previous prime is 649760539. The next prime is 649760561. The reversal of 649760549 is 945067946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 471671524 + 178089025 = 21718^2 + 13345^2 .

It is a cyclic number.

It is not a de Polignac number, because 649760549 - 2²⁴ = 632983333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649760497 and 649760506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649760539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6129764 + ... + 6129869.

It is an arithmetic number, because the mean of its divisors is an integer number (165505059).

Almost surely, 2^649760549 is an apocalyptic number.

It is an amenable number.

649760549 is a deficient number, since it is larger than the sum of its proper divisors (12259687).

649760549 is a wasteful number, since it uses less digits than its factorization.

649760549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12259686.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 649760549 is about 25490.4011149295. The cubic root of 649760549 is about 866.1327221124.

The spelling of 649760549 in words is "six hundred forty-nine million, seven hundred sixty thousand, five hundred forty-nine".