650720321 has 4 divisors (see below), whose sum is σ = 659634372. Its totient is φ = 641806272.

The previous prime is 650720293. The next prime is 650720327. The reversal of 650720321 is 123027056.

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 357625921 + 293094400 = 18911^2 + 17120^2 .

It is a cyclic number.

It is not a de Polignac number, because 650720321 - 2¹⁰ = 650719297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650720327) 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, 4456916 + ... + 4457061.

It is an arithmetic number, because the mean of its divisors is an integer number (164908593).

Almost surely, 2^650720321 is an apocalyptic number.

It is an amenable number.

650720321 is a deficient number, since it is larger than the sum of its proper divisors (8914051).

650720321 is an equidigital number, since it uses as much as digits as its factorization.

650720321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8914050.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 650720321 is about 25509.2203134474. The cubic root of 650720321 is about 866.5589719402.

Adding to 650720321 its reverse (123027056), we get a palindrome (773747377).

The spelling of 650720321 in words is "six hundred fifty million, seven hundred twenty thousand, three hundred twenty-one".