991650383 has 2 divisors, whose sum is σ = 991650384. Its totient is φ = 991650382.

The previous prime is 991650349. The next prime is 991650419. The reversal of 991650383 is 383056199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991650383 - 2¹⁴ = 991633999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991656383) 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, 495825191 + 495825192.

It is an arithmetic number, because the mean of its divisors is an integer number (495825192).

Almost surely, 2^991650383 is an apocalyptic number.

991650383 is a deficient number, since it is larger than the sum of its proper divisors (1).

991650383 is an equidigital number, since it uses as much as digits as its factorization.

991650383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 991650383 is about 31490.4808315148. The cubic root of 991650383 is about 997.2090119660.

The spelling of 991650383 in words is "nine hundred ninety-one million, six hundred fifty thousand, three hundred eighty-three".