1131000331 has 4 divisors (see below), whose sum is σ = 1132036192. Its totient is φ = 1129964472.

The previous prime is 1131000317. The next prime is 1131000347. The reversal of 1131000331 is 1330001311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1330001311 = 19 ⋅70000069.

It is a cyclic number.

It is not a de Polignac number, because 1131000331 - 2¹¹ = 1130998283 is a prime.

It is a super-4 number, since 4×1131000331⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131000371) 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, 516291 + ... + 518476.

It is an arithmetic number, because the mean of its divisors is an integer number (283009048).

Almost surely, 2^1131000331 is an apocalyptic number.

1131000331 is a deficient number, since it is larger than the sum of its proper divisors (1035861).

1131000331 is a wasteful number, since it uses less digits than its factorization.

1131000331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035860.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 1131000331 is about 33630.3483627512. The cubic root of 1131000331 is about 1041.8876992232.

Adding to 1131000331 its reverse (1330001311), we get a palindrome (2461001642).

The spelling of 1131000331 in words is "one billion, one hundred thirty-one million, three hundred thirty-one", and thus it is an aban number.