1131200001 has 12 divisors (see below), whose sum is σ = 1678117012. Its totient is φ = 733751136.

The previous prime is 1131199997. The next prime is 1131200003. The reversal of 1131200001 is 1000021311.

It can be written as a sum of positive squares in 2 ways, for example, as 624950001 + 506250000 = 24999^2 + 22500^2 .

It is not a de Polignac number, because 1131200001 - 2² = 1131199997 is a prime.

It is a super-2 number, since 2×1131200001² = 2559226884524800002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131200003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1698166 + ... + 1698831.

Almost surely, 2^1131200001 is an apocalyptic number.

It is an amenable number.

1131200001 is a deficient number, since it is larger than the sum of its proper divisors (546917011).

1131200001 is a wasteful number, since it uses less digits than its factorization.

1131200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397040 (or 3397037 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1131200001 is about 33633.3168301909. The cubic root of 1131200001 is about 1041.9490082166.

Adding to 1131200001 its reverse (1000021311), we get a palindrome (2131221312).

The spelling of 1131200001 in words is "one billion, one hundred thirty-one million, two hundred thousand, one".