1131538 has 4 divisors (see below), whose sum is σ = 1697310. Its totient is φ = 565768.

The previous prime is 1131523. The next prime is 1131547. The reversal of 1131538 is 8351311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8351311 = 709 ⋅11779.

It can be written as a sum of positive squares in only one way, i.e., 1075369 + 56169 = 1037^2 + 237^2 .

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282883 + ... + 282886.

2^1131538 is an apocalyptic number.

1131538 is a deficient number, since it is larger than the sum of its proper divisors (565772).

1131538 is an equidigital number, since it uses as much as digits as its factorization.

1131538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565771.

The product of its digits is 360, while the sum is 22.

The square root of 1131538 is about 1063.7377496357. The cubic root of 1131538 is about 104.2052774910.

Adding to 1131538 its reverse (8351311), we get a palindrome (9482849).

The spelling of 1131538 in words is "one million, one hundred thirty-one thousand, five hundred thirty-eight".