650691521 has 2 divisors, whose sum is σ = 650691522. Its totient is φ = 650691520.

The previous prime is 650691491. The next prime is 650691527. The reversal of 650691521 is 125196056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582546496 + 68145025 = 24136^2 + 8255^2 .

It is a cyclic number.

It is not a de Polignac number, because 650691521 - 2¹⁰ = 650690497 is a prime.

It is not a weakly prime, because it can be changed into another prime (650691527) 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 as a sum of consecutive naturals, namely, 325345760 + 325345761.

It is an arithmetic number, because the mean of its divisors is an integer number (325345761).

Almost surely, 2^650691521 is an apocalyptic number.

It is an amenable number.

650691521 is a deficient number, since it is larger than the sum of its proper divisors (1).

650691521 is an equidigital number, since it uses as much as digits as its factorization.

650691521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 650691521 is about 25508.6558054320. The cubic root of 650691521 is about 866.5461875095.

The spelling of 650691521 in words is "six hundred fifty million, six hundred ninety-one thousand, five hundred twenty-one".