650646989 has 2 divisors, whose sum is σ = 650646990. Its totient is φ = 650646988.

The previous prime is 650646959. The next prime is 650647021. The reversal of 650646989 is 989646056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 577681225 + 72965764 = 24035^2 + 8542^2 .

It is a cyclic number.

It is not a de Polignac number, because 650646989 - 2²⁰ = 649598413 is a prime.

It is a super-2 number, since 2×650646989² = 846683008589532242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 650646989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650646959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325323494 + 325323495.

It is an arithmetic number, because the mean of its divisors is an integer number (325323495).

Almost surely, 2^650646989 is an apocalyptic number.

It is an amenable number.

650646989 is a deficient number, since it is larger than the sum of its proper divisors (1).

650646989 is an equidigital number, since it uses as much as digits as its factorization.

650646989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The square root of 650646989 is about 25507.7829103197. The cubic root of 650646989 is about 866.5264188409.

The spelling of 650646989 in words is "six hundred fifty million, six hundred forty-six thousand, nine hundred eighty-nine".