991134503531 has 8 divisors (see below), whose sum is σ = 1014360990720. Its totient is φ = 967916054952.

The previous prime is 991134503483. The next prime is 991134503533. The reversal of 991134503531 is 135305431199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991134503531 - 2²² = 991130309227 is a prime.

It is a super-2 number, since 2×991134503531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991134503533) 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 in 7 ways as a sum of consecutive naturals, for example, 1759811 + ... + 2253708.

It is an arithmetic number, because the mean of its divisors is an integer number (126795123840).

Almost surely, 2^991134503531 is an apocalyptic number.

991134503531 is a deficient number, since it is larger than the sum of its proper divisors (23226487189).

991134503531 is a wasteful number, since it uses less digits than its factorization.

991134503531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019305.

The product of its (nonzero) digits is 218700, while the sum is 44.

The spelling of 991134503531 in words is "nine hundred ninety-one billion, one hundred thirty-four million, five hundred three thousand, five hundred thirty-one".