1131213100 has 36 divisors (see below), whose sum is σ = 2456280288. Its totient is φ = 452200000.

The previous prime is 1131213073. The next prime is 1131213101. The reversal of 1131213100 is 13121311.

It is a super-2 number, since 2×1131213100² = 2559286155223220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131213101) 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, 235725 + ... + 240475.

It is an arithmetic number, because the mean of its divisors is an integer number (68230008).

Almost surely, 2^1131213100 is an apocalyptic number.

1131213100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131213100 is an abundant number, since it is smaller than the sum of its proper divisors (1325067188).

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

1131213100 is a wasteful number, since it uses less digits than its factorization.

1131213100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146 (or 7139 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1131213100 is about 33633.5115621310. The cubic root of 1131213100 is about 1041.9530300334.

Adding to 1131213100 its reverse (13121311), we get a palindrome (1144334411).

The spelling of 1131213100 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred".