650161721 has 4 divisors (see below), whose sum is σ = 709267344. Its totient is φ = 591056100.

The previous prime is 650161717. The next prime is 650161781. The reversal of 650161721 is 127161056.

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 650161721 - 2² = 650161717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650161781) 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, 29552795 + ... + 29552816.

It is an arithmetic number, because the mean of its divisors is an integer number (177316836).

Almost surely, 2^650161721 is an apocalyptic number.

It is an amenable number.

650161721 is a deficient number, since it is larger than the sum of its proper divisors (59105623).

650161721 is a wasteful number, since it uses less digits than its factorization.

650161721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59105622.

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

The square root of 650161721 is about 25498.2689804622. The cubic root of 650161721 is about 866.3109399244.

The spelling of 650161721 in words is "six hundred fifty million, one hundred sixty-one thousand, seven hundred twenty-one".