991134503533 has 2 divisors, whose sum is σ = 991134503534. Its totient is φ = 991134503532.

The previous prime is 991134503483. The next prime is 991134503551. The reversal of 991134503533 is 335305431199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 918879450724 + 72255052809 = 958582^2 + 268803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991134503533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991134507533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495567251766 + 495567251767.

It is an arithmetic number, because the mean of its divisors is an integer number (495567251767).

Almost surely, 2^991134503533 is an apocalyptic number.

It is an amenable number.

991134503533 is a deficient number, since it is larger than the sum of its proper divisors (1).

991134503533 is an equidigital number, since it uses as much as digits as its factorization.

991134503533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 46.

The spelling of 991134503533 in words is "nine hundred ninety-one billion, one hundred thirty-four million, five hundred three thousand, five hundred thirty-three".