650351993 has 2 divisors, whose sum is σ = 650351994. Its totient is φ = 650351992.

The previous prime is 650351981. The next prime is 650352011. The reversal of 650351993 is 399153056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398082304 + 252269689 = 19952^2 + 15883^2 .

It is a cyclic number.

It is not a de Polignac number, because 650351993 - 2¹² = 650347897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 650351993.

It is not a weakly prime, because it can be changed into another prime (650351953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325175996 + 325175997.

It is an arithmetic number, because the mean of its divisors is an integer number (325175997).

Almost surely, 2^650351993 is an apocalyptic number.

It is an amenable number.

650351993 is a deficient number, since it is larger than the sum of its proper divisors (1).

650351993 is an equidigital number, since it uses as much as digits as its factorization.

650351993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109350, while the sum is 41.

The square root of 650351993 is about 25501.9997843306. Note that the first 3 decimals coincide. The cubic root of 650351993 is about 866.3954412788.

The spelling of 650351993 in words is "six hundred fifty million, three hundred fifty-one thousand, nine hundred ninety-three".