650939561 has 4 divisors (see below), whose sum is σ = 653341824. Its totient is φ = 648537300.

The previous prime is 650939543. The next prime is 650939609. The reversal of 650939561 is 165939056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 650939561 - 2¹⁴ = 650923177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650933561) 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, 1200725 + ... + 1201266.

It is an arithmetic number, because the mean of its divisors is an integer number (163335456).

Almost surely, 2^650939561 is an apocalyptic number.

It is an amenable number.

650939561 is a deficient number, since it is larger than the sum of its proper divisors (2402263).

650939561 is a wasteful number, since it uses less digits than its factorization.

650939561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402262.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 650939561 is about 25513.5172212692. The cubic root of 650939561 is about 866.6562810557.

The spelling of 650939561 in words is "six hundred fifty million, nine hundred thirty-nine thousand, five hundred sixty-one".