650521609 has 4 divisors (see below), whose sum is σ = 688787604. Its totient is φ = 612255616.

The previous prime is 650521607. The next prime is 650521637. The reversal of 650521609 is 906125056.

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 251920384 + 398601225 = 15872^2 + 19965^2 .

It is a cyclic number.

It is not a de Polignac number, because 650521609 - 2¹ = 650521607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650521603) 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, 19132972 + ... + 19133005.

It is an arithmetic number, because the mean of its divisors is an integer number (172196901).

Almost surely, 2^650521609 is an apocalyptic number.

It is an amenable number.

650521609 is a deficient number, since it is larger than the sum of its proper divisors (38265995).

650521609 is a wasteful number, since it uses less digits than its factorization.

650521609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38265994.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 650521609 is about 25505.3251106509. The cubic root of 650521609 is about 866.4707552406.

The spelling of 650521609 in words is "six hundred fifty million, five hundred twenty-one thousand, six hundred nine".