1331139 has 8 divisors (see below), whose sum is σ = 1780240. Its totient is φ = 884736.

The previous prime is 1331123. The next prime is 1331153. The reversal of 1331139 is 9311331.

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

It is not a de Polignac number, because 1331139 - 2⁴ = 1331123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1347 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (222530).

2^1331139 is an apocalyptic number.

1331139 is a deficient number, since it is larger than the sum of its proper divisors (449101).

1331139 is an equidigital number, since it uses as much as digits as its factorization.

1331139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 243, while the sum is 21.

The square root of 1331139 is about 1153.7499729144. The cubic root of 1331139 is about 110.0038290678.

Subtracting from 1331139 its product of digits (243), we obtain a triangular number (1330896 = T₁₆₃₁).

The spelling of 1331139 in words is "one million, three hundred thirty-one thousand, one hundred thirty-nine".