650520649 has 4 divisors (see below), whose sum is σ = 650679700. Its totient is φ = 650361600.

The previous prime is 650520631. The next prime is 650520667. The reversal of 650520649 is 946025056.

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

It is an interprime number because it is at equal distance from previous prime (650520631) and next prime (650520667).

It can be written as a sum of positive squares in 2 ways, for example, as 370293049 + 280227600 = 19243^2 + 16740^2 .

It is a cyclic number.

It is not a de Polignac number, because 650520649 - 2⁹ = 650520137 is a prime.

It is a super-2 number, since 2×650520649² = 846354229550762402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650520149) 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, 73224 + ... + 81625.

It is an arithmetic number, because the mean of its divisors is an integer number (162669925).

Almost surely, 2^650520649 is an apocalyptic number.

It is an amenable number.

650520649 is a deficient number, since it is larger than the sum of its proper divisors (159051).

650520649 is a wasteful number, since it uses less digits than its factorization.

650520649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159050.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 650520649 is about 25505.3062910446. The cubic root of 650520649 is about 866.4703290122.

The spelling of 650520649 in words is "six hundred fifty million, five hundred twenty thousand, six hundred forty-nine".