650651021 has 4 divisors (see below), whose sum is σ = 651657312. Its totient is φ = 649644732.

The previous prime is 650650999. The next prime is 650651041. The reversal of 650651021 is 120156056.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650651021 is a prime.

It is a super-2 number, since 2×650651021² = 846693502256684882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650651041) 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, 502175 + ... + 503468.

It is an arithmetic number, because the mean of its divisors is an integer number (162914328).

Almost surely, 2^650651021 is an apocalyptic number.

It is an amenable number.

650651021 is a deficient number, since it is larger than the sum of its proper divisors (1006291).

650651021 is a wasteful number, since it uses less digits than its factorization.

650651021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006290.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 650651021 is about 25507.8619448985. The cubic root of 650651021 is about 866.5282087656.

The spelling of 650651021 in words is "six hundred fifty million, six hundred fifty-one thousand, twenty-one".