1131161556 has 24 divisors (see below), whose sum is σ = 3016431040. Its totient is φ = 323188992.

The previous prime is 1131161543. The next prime is 1131161557. The reversal of 1131161556 is 6551611311.

It is a super-2 number, since 2×1131161556² = 2559052931544682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131161557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6733021 + ... + 6733188.

Almost surely, 2^1131161556 is an apocalyptic number.

It is an amenable number.

1131161556 is an abundant number, since it is smaller than the sum of its proper divisors (1885269484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131161556 is a wasteful number, since it uses less digits than its factorization.

1131161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13466223 (or 13466221 counting only the distinct ones).

The product of its digits is 2700, while the sum is 30.

The square root of 1131161556 is about 33632.7452938353. The cubic root of 1131161556 is about 1041.9372041786.

Adding to 1131161556 its reverse (6551611311), we get a palindrome (7682772867).

The spelling of 1131161556 in words is "one billion, one hundred thirty-one million, one hundred sixty-one thousand, five hundred fifty-six".