991434601 has 2 divisors, whose sum is σ = 991434602. Its totient is φ = 991434600.

The previous prime is 991434583. The next prime is 991434641. The reversal of 991434601 is 106434199.

991434601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777573225 + 213861376 = 27885^2 + 14624^2 .

It is a cyclic number.

It is not a de Polignac number, because 991434601 - 2¹³ = 991426409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (991434641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495717300 + 495717301.

It is an arithmetic number, because the mean of its divisors is an integer number (495717301).

Almost surely, 2^991434601 is an apocalyptic number.

It is an amenable number.

991434601 is a deficient number, since it is larger than the sum of its proper divisors (1).

991434601 is an equidigital number, since it uses as much as digits as its factorization.

991434601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 991434601 is about 31487.0544986348. The cubic root of 991434601 is about 997.1366762019.

The spelling of 991434601 in words is "nine hundred ninety-one million, four hundred thirty-four thousand, six hundred one".