650721161 has 4 divisors (see below), whose sum is σ = 652813824. Its totient is φ = 648628500.

The previous prime is 650721131. The next prime is 650721167. The reversal of 650721161 is 161127056.

650721161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 650721161 - 2¹⁰ = 650720137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650721167) 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, 1045865 + ... + 1046486.

It is an arithmetic number, because the mean of its divisors is an integer number (163203456).

Almost surely, 2^650721161 is an apocalyptic number.

It is an amenable number.

650721161 is a deficient number, since it is larger than the sum of its proper divisors (2092663).

650721161 is a wasteful number, since it uses less digits than its factorization.

650721161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092662.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 650721161 is about 25509.2367780771. The cubic root of 650721161 is about 866.5593448138.

The spelling of 650721161 in words is "six hundred fifty million, seven hundred twenty-one thousand, one hundred sixty-one".