991350907 has 2 divisors, whose sum is σ = 991350908. Its totient is φ = 991350906.

The previous prime is 991350901. The next prime is 991350947. The reversal of 991350907 is 709053199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991350907 - 2¹¹ = 991348859 is a prime.

It is not a weakly prime, because it can be changed into another prime (991350901) 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, 495675453 + 495675454.

It is an arithmetic number, because the mean of its divisors is an integer number (495675454).

Almost surely, 2^991350907 is an apocalyptic number.

991350907 is a deficient number, since it is larger than the sum of its proper divisors (1).

991350907 is an equidigital number, since it uses as much as digits as its factorization.

991350907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 991350907 is about 31485.7254482091. The cubic root of 991350907 is about 997.1086169615.

The spelling of 991350907 in words is "nine hundred ninety-one million, three hundred fifty thousand, nine hundred seven".