650991823 has 2 divisors, whose sum is σ = 650991824. Its totient is φ = 650991822.

The previous prime is 650991787. The next prime is 650991911. The reversal of 650991823 is 328199056.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 650991823 - 2⁹ = 650991311 is a prime.

It is a super-2 number, since 2×650991823² = 847580707225726658, 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 650991823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650991223) 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 as a sum of consecutive naturals, namely, 325495911 + 325495912.

It is an arithmetic number, because the mean of its divisors is an integer number (325495912).

Almost surely, 2^650991823 is an apocalyptic number.

650991823 is a deficient number, since it is larger than the sum of its proper divisors (1).

650991823 is an equidigital number, since it uses as much as digits as its factorization.

650991823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 650991823 is about 25514.5414028942. The cubic root of 650991823 is about 866.6794741861.

The spelling of 650991823 in words is "six hundred fifty million, nine hundred ninety-one thousand, eight hundred twenty-three".