650904521 has 4 divisors (see below), whose sum is σ = 656664852. Its totient is φ = 645144192.

The previous prime is 650904511. The next prime is 650904539. The reversal of 650904521 is 125409056.

It is a happy number.

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 181575625 + 469328896 = 13475^2 + 21664^2 .

It is a cyclic number.

It is not a de Polignac number, because 650904521 - 2²² = 646710217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650904511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2879996 + ... + 2880221.

It is an arithmetic number, because the mean of its divisors is an integer number (164166213).

Almost surely, 2^650904521 is an apocalyptic number.

It is an amenable number.

650904521 is a deficient number, since it is larger than the sum of its proper divisors (5760331).

650904521 is a wasteful number, since it uses less digits than its factorization.

650904521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760330.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 650904521 is about 25512.8305172123. The cubic root of 650904521 is about 866.6407301081.

The spelling of 650904521 in words is "six hundred fifty million, nine hundred four thousand, five hundred twenty-one".