650512391 has 2 divisors, whose sum is σ = 650512392. Its totient is φ = 650512390.

The previous prime is 650512337. The next prime is 650512393. The reversal of 650512391 is 193215056.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650512391 is a prime.

Together with 650512393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650512393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325256195 + 325256196.

It is an arithmetic number, because the mean of its divisors is an integer number (325256196).

Almost surely, 2^650512391 is an apocalyptic number.

650512391 is a deficient number, since it is larger than the sum of its proper divisors (1).

650512391 is an equidigital number, since it uses as much as digits as its factorization.

650512391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 650512391 is about 25505.1444026494. The cubic root of 650512391 is about 866.4666625427.

The spelling of 650512391 in words is "six hundred fifty million, five hundred twelve thousand, three hundred ninety-one".