1131021000 has 96 divisors (see below), whose sum is σ = 3822881400. Its totient is φ = 301603200.

The previous prime is 1131020993. The next prime is 1131021011. The reversal of 1131021000 is 1201311.

It can be written as a sum of positive squares in 4 ways, for example, as 413959716 + 717061284 = 20346^2 + 26778^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53835 + ... + 71834.

Almost surely, 2^1131021000 is an apocalyptic number.

1131021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131021000 is an abundant number, since it is smaller than the sum of its proper divisors (2691860400).

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

1131021000 is a wasteful number, since it uses less digits than its factorization.

1131021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125696 (or 125679 counting only the distinct ones).

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

The square root of 1131021000 is about 33630.6556581938. The cubic root of 1131021000 is about 1041.8940460075.

Adding to 1131021000 its reverse (1201311), we get a palindrome (1132222311).

The spelling of 1131021000 in words is "one billion, one hundred thirty-one million, twenty-one thousand".