649505597 has 4 divisors (see below), whose sum is σ = 699467580. Its totient is φ = 599543616.

The previous prime is 649505561. The next prime is 649505599. The reversal of 649505597 is 795505946.

It is a happy number.

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 66814276 + 582691321 = 8174^2 + 24139^2 .

It is a cyclic number.

It is not a de Polignac number, because 649505597 - 2¹⁰ = 649504573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649505599) 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, 24980972 + ... + 24980997.

It is an arithmetic number, because the mean of its divisors is an integer number (174866895).

Almost surely, 2^649505597 is an apocalyptic number.

It is an amenable number.

649505597 is a deficient number, since it is larger than the sum of its proper divisors (49961983).

649505597 is a wasteful number, since it uses less digits than its factorization.

649505597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49961982.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The square root of 649505597 is about 25485.3996829557. The cubic root of 649505597 is about 866.0194233705.

The spelling of 649505597 in words is "six hundred forty-nine million, five hundred five thousand, five hundred ninety-seven".