650949561 has 16 divisors (see below), whose sum is σ = 970848000. Its totient is φ = 431051184.

The previous prime is 650949539. The next prime is 650949569. The reversal of 650949561 is 165949056.

It is a happy number.

It is not a de Polignac number, because 650949561 - 2¹⁴ = 650933177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (650949569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76881 + ... + 84926.

It is an arithmetic number, because the mean of its divisors is an integer number (60678000).

Almost surely, 2^650949561 is an apocalyptic number.

It is an amenable number.

650949561 is a deficient number, since it is larger than the sum of its proper divisors (319898439).

650949561 is a wasteful number, since it uses less digits than its factorization.

650949561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161965 (or 161959 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 650949561 is about 25513.7131950643. The cubic root of 650949561 is about 866.6607190092.

The spelling of 650949561 in words is "six hundred fifty million, nine hundred forty-nine thousand, five hundred sixty-one".