11581787 has 18 divisors (see below), whose sum is σ = 13894092. Its totient is φ = 9625224.

The previous prime is 11581783. The next prime is 11581789. The reversal of 11581787 is 78718511.

It is not a de Polignac number, because 11581787 - 2² = 11581783 is a prime.

It is a super-2 number, since 2×11581787² = 268275580226738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11581787.

It is not an unprimeable number, because it can be changed into a prime (11581781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 108188 + ... + 108294.

It is an arithmetic number, because the mean of its divisors is an integer number (771894).

Almost surely, 2^11581787 is an apocalyptic number.

11581787 is a deficient number, since it is larger than the sum of its proper divisors (2312305).

11581787 is an equidigital number, since it uses as much as digits as its factorization.

11581787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 161 counting only the distinct ones).

The product of its digits is 15680, while the sum is 38.

The square root of 11581787 is about 3403.2024623874. The cubic root of 11581787 is about 226.2517035371.

The spelling of 11581787 in words is "eleven million, five hundred eighty-one thousand, seven hundred eighty-seven".