1131001200 has 360 divisors, whose sum is σ = 4610616608. Its totient is φ = 251320320.

The previous prime is 1131001199. The next prime is 1131001213. The reversal of 1131001200 is 21001311.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 931794 + ... + 933006.

Almost surely, 2^1131001200 is an apocalyptic number.

1131001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2305308304).

1131001200 is an abundant number, since it is smaller than the sum of its proper divisors (3479615408).

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

1131001200 is a wasteful number, since it uses less digits than its factorization.

1131001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281 (or 1267 counting only the distinct ones).

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

The square root of 1131001200 is about 33630.3612826267. The cubic root of 1131001200 is about 1041.8879660666.

Adding to 1131001200 its reverse (21001311), we get a palindrome (1152002511).

The spelling of 1131001200 in words is "one billion, one hundred thirty-one million, one thousand, two hundred".