1131487 has 4 divisors (see below), whose sum is σ = 1293136. Its totient is φ = 969840.

The previous prime is 1131479. The next prime is 1131491. The reversal of 1131487 is 7841311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7841311 = 71 ⋅110441.

It is a cyclic number.

It is not a de Polignac number, because 1131487 - 2³ = 1131479 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 (1131437) 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, 80814 + ... + 80827.

It is an arithmetic number, because the mean of its divisors is an integer number (323284).

2^1131487 is an apocalyptic number.

1131487 is a deficient number, since it is larger than the sum of its proper divisors (161649).

1131487 is an equidigital number, since it uses as much as digits as its factorization.

1131487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161648.

The product of its digits is 672, while the sum is 25.

The square root of 1131487 is about 1063.7137772916. The cubic root of 1131487 is about 104.2037119083.

Adding to 1131487 its reverse (7841311), we get a palindrome (8972798).

It can be divided in two parts, 113 and 1487, that added together give a square (1600 = 40²).

The spelling of 1131487 in words is "one million, one hundred thirty-one thousand, four hundred eighty-seven".