650221405 has 4 divisors (see below), whose sum is σ = 780265692. Its totient is φ = 520177120.

The previous prime is 650221391. The next prime is 650221409. The reversal of 650221405 is 504122056.

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 329023321 + 321198084 = 18139^2 + 17922^2 .

It is not a de Polignac number, because 650221405 - 2⁷ = 650221277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 650221405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650221409) 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, 65022136 + ... + 65022145.

It is an arithmetic number, because the mean of its divisors is an integer number (195066423).

Almost surely, 2^650221405 is an apocalyptic number.

It is an amenable number.

650221405 is a deficient number, since it is larger than the sum of its proper divisors (130044287).

650221405 is a wasteful number, since it uses less digits than its factorization.

650221405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130044286.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 650221405 is about 25499.4393075613. The cubic root of 650221405 is about 866.3374478523.

The spelling of 650221405 in words is "six hundred fifty million, two hundred twenty-one thousand, four hundred five".