11887771 has 4 divisors (see below), whose sum is σ = 13586032. Its totient is φ = 10189512.

The previous prime is 11887769. The next prime is 11887781. The reversal of 11887771 is 17778811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17778811 = 241 ⋅73771.

It is a cyclic number.

It is not a de Polignac number, because 11887771 - 2¹ = 11887769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11887721) 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 3 ways as a sum of consecutive naturals, for example, 849120 + ... + 849133.

It is an arithmetic number, because the mean of its divisors is an integer number (3396508).

Almost surely, 2^11887771 is an apocalyptic number.

11887771 is a deficient number, since it is larger than the sum of its proper divisors (1698261).

11887771 is an equidigital number, since it uses as much as digits as its factorization.

11887771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698260.

The product of its digits is 21952, while the sum is 40.

The square root of 11887771 is about 3447.8647015218. The cubic root of 11887771 is about 228.2268888952.

The spelling of 11887771 in words is "eleven million, eight hundred eighty-seven thousand, seven hundred seventy-one".