1131001020 has 72 divisors (see below), whose sum is σ = 3433706640. Its totient is φ = 301336320.

The previous prime is 1131001019. The next prime is 1131001097. The reversal of 1131001020 is 201001311.

1131001020 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 1131000993 and 1131001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289480 + ... + 293360.

It is an arithmetic number, because the mean of its divisors is an integer number (47690370).

Almost surely, 2^1131001020 is an apocalyptic number.

1131001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131001020 is an abundant number, since it is smaller than the sum of its proper divisors (2302705620).

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

1131001020 is a wasteful number, since it uses less digits than its factorization.

1131001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515 (or 5510 counting only the distinct ones).

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

The square root of 1131001020 is about 33630.3586064734. The cubic root of 1131001020 is about 1041.8879107941.

Adding to 1131001020 its reverse (201001311), we get a palindrome (1332002331).

The spelling of 1131001020 in words is "one billion, one hundred thirty-one million, one thousand, twenty".