650512561 has 4 divisors (see below), whose sum is σ = 650593792. Its totient is φ = 650431332.

The previous prime is 650512559. The next prime is 650512567. The reversal of 650512561 is 165215056.

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 650512561 - 2¹ = 650512559 is a prime.

It is a super-3 number, since 3×650512561³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650512567) 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, 27105 + ... + 45118.

It is an arithmetic number, because the mean of its divisors is an integer number (162648448).

Almost surely, 2^650512561 is an apocalyptic number.

It is an amenable number.

650512561 is a deficient number, since it is larger than the sum of its proper divisors (81231).

650512561 is an equidigital number, since it uses as much as digits as its factorization.

650512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81230.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 650512561 is about 25505.1477353102. The cubic root of 650512561 is about 866.4667380214.

The spelling of 650512561 in words is "six hundred fifty million, five hundred twelve thousand, five hundred sixty-one".