650155621 has 2 divisors, whose sum is σ = 650155622. Its totient is φ = 650155620.

The previous prime is 650155609. The next prime is 650155637. The reversal of 650155621 is 126551056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525051396 + 125104225 = 22914^2 + 11185^2 .

It is a cyclic number.

It is not a de Polignac number, because 650155621 - 2⁵ = 650155589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651155621) 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, 325077810 + 325077811.

It is an arithmetic number, because the mean of its divisors is an integer number (325077811).

Almost surely, 2^650155621 is an apocalyptic number.

It is an amenable number.

650155621 is a deficient number, since it is larger than the sum of its proper divisors (1).

650155621 is an equidigital number, since it uses as much as digits as its factorization.

650155621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 650155621 is about 25498.1493642186. The cubic root of 650155621 is about 866.3082305917.

The spelling of 650155621 in words is "six hundred fifty million, one hundred fifty-five thousand, six hundred twenty-one".