650650621 has 2 divisors, whose sum is σ = 650650622. Its totient is φ = 650650620.

The previous prime is 650650619. The next prime is 650650633. The reversal of 650650621 is 126056056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378730521 + 271920100 = 19461^2 + 16490^2 .

It is a cyclic number.

It is not a de Polignac number, because 650650621 - 2¹ = 650650619 is a prime.

Together with 650650619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650650681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325325310 + 325325311.

It is an arithmetic number, because the mean of its divisors is an integer number (325325311).

Almost surely, 2^650650621 is an apocalyptic number.

It is an amenable number.

650650621 is a deficient number, since it is larger than the sum of its proper divisors (1).

650650621 is an equidigital number, since it uses as much as digits as its factorization.

650650621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 650650621 is about 25507.8541041774. The cubic root of 650650621 is about 866.5280311940.

The spelling of 650650621 in words is "six hundred fifty million, six hundred fifty thousand, six hundred twenty-one".