1138531 has 4 divisors (see below), whose sum is σ = 1155592. Its totient is φ = 1121472.

The previous prime is 1138519. The next prime is 1138547. The reversal of 1138531 is 1358311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1138531 - 2⁹ = 1138019 is a prime.

It is a super-2 number, since 2×1138531² = 2592505675922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138591) 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, 8430 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (288898).

2^1138531 is an apocalyptic number.

1138531 is a deficient number, since it is larger than the sum of its proper divisors (17061).

1138531 is an equidigital number, since it uses as much as digits as its factorization.

1138531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17060.

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

The square root of 1138531 is about 1067.0196811681. The cubic root of 1138531 is about 104.4195025783.

The spelling of 1138531 in words is "one million, one hundred thirty-eight thousand, five hundred thirty-one".