991134439 has 2 divisors, whose sum is σ = 991134440. Its totient is φ = 991134438.

The previous prime is 991134433. The next prime is 991134491. The reversal of 991134439 is 934431199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991134439 - 2⁵ = 991134407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 991134395 and 991134404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991134433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495567219 + 495567220.

It is an arithmetic number, because the mean of its divisors is an integer number (495567220).

Almost surely, 2^991134439 is an apocalyptic number.

991134439 is a deficient number, since it is larger than the sum of its proper divisors (1).

991134439 is an equidigital number, since it uses as much as digits as its factorization.

991134439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 43.

The square root of 991134439 is about 31482.2877027703. The cubic root of 991134439 is about 997.0360366005.

The spelling of 991134439 in words is "nine hundred ninety-one million, one hundred thirty-four thousand, four hundred thirty-nine".