11085785531 has 4 divisors (see below), whose sum is σ = 11142058752. Its totient is φ = 11029512312.

The previous prime is 11085785507. The next prime is 11085785539. The reversal of 11085785531 is 13558758011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11085785531 is a prime.

It is a super-2 number, since 2×11085785531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11085785539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28136315 + ... + 28136708.

It is an arithmetic number, because the mean of its divisors is an integer number (2785514688).

Almost surely, 2^11085785531 is an apocalyptic number.

11085785531 is a deficient number, since it is larger than the sum of its proper divisors (56273221).

11085785531 is an equidigital number, since it uses as much as digits as its factorization.

11085785531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56273220.

The product of its (nonzero) digits is 168000, while the sum is 44.

The spelling of 11085785531 in words is "eleven billion, eighty-five million, seven hundred eighty-five thousand, five hundred thirty-one".