650090621 has 4 divisors (see below), whose sum is σ = 657395100. Its totient is φ = 642786144.

The previous prime is 650090599. The next prime is 650090627. The reversal of 650090621 is 126090056.

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 182925625 + 467164996 = 13525^2 + 21614^2 .

It is a cyclic number.

It is not a de Polignac number, because 650090621 - 2¹⁰ = 650089597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650090627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3652106 + ... + 3652283.

It is an arithmetic number, because the mean of its divisors is an integer number (164348775).

Almost surely, 2^650090621 is an apocalyptic number.

It is an amenable number.

650090621 is a deficient number, since it is larger than the sum of its proper divisors (7304479).

650090621 is an equidigital number, since it uses as much as digits as its factorization.

650090621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304478.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 650090621 is about 25496.8747300527. The cubic root of 650090621 is about 866.2793596005.

The spelling of 650090621 in words is "six hundred fifty million, ninety thousand, six hundred twenty-one".