11989271 has 12 divisors (see below), whose sum is σ = 14009688. Its totient is φ = 10230192.

The previous prime is 11989253. The next prime is 11989283. The reversal of 11989271 is 17298911.

It is a de Polignac number, because none of the positive numbers 2^k-11989271 is a prime.

It is a super-2 number, since 2×11989271² = 287485238222882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14645 + ... + 15441.

It is an arithmetic number, because the mean of its divisors is an integer number (1167474).

Almost surely, 2^11989271 is an apocalyptic number.

11989271 is a deficient number, since it is larger than the sum of its proper divisors (2020417).

11989271 is an equidigital number, since it uses as much as digits as its factorization.

11989271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118 (or 1111 counting only the distinct ones).

The product of its digits is 9072, while the sum is 38.

The square root of 11989271 is about 3462.5526710795. The cubic root of 11989271 is about 228.8745968373.

The spelling of 11989271 in words is "eleven million, nine hundred eighty-nine thousand, two hundred seventy-one".