650631621 has 4 divisors (see below), whose sum is σ = 867508832. Its totient is φ = 433754412.

The previous prime is 650631607. The next prime is 650631623. The reversal of 650631621 is 126136056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 650631621 - 2⁶ = 650631557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650631623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108438601 + ... + 108438606.

It is an arithmetic number, because the mean of its divisors is an integer number (216877208).

Almost surely, 2^650631621 is an apocalyptic number.

It is an amenable number.

650631621 is a deficient number, since it is larger than the sum of its proper divisors (216877211).

650631621 is a wasteful number, since it uses less digits than its factorization.

650631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216877210.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 650631621 is about 25507.4816671501. The cubic root of 650631621 is about 866.5195964610.

Adding to 650631621 its reverse (126136056), we get a palindrome (776767677).

The spelling of 650631621 in words is "six hundred fifty million, six hundred thirty-one thousand, six hundred twenty-one".