1111001020 has 48 divisors (see below), whose sum is σ = 2417052960. Its totient is φ = 428454656.

The previous prime is 1111000997. The next prime is 1111001027. The reversal of 1111001020 is 201001111.

It is a junction number, because it is equal to n+sod(n) for n = 1111000994 and 1111001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111001027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743394 + ... + 744886.

It is an arithmetic number, because the mean of its divisors is an integer number (50355270).

Almost surely, 2^1111001020 is an apocalyptic number.

1111001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111001020 is an abundant number, since it is smaller than the sum of its proper divisors (1306051940).

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

1111001020 is a wasteful number, since it uses less digits than its factorization.

1111001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814 (or 2812 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1111001020 is about 33331.6819257595. The cubic root of 1111001020 is about 1035.7099596535.

Adding to 1111001020 its reverse (201001111), we get a palindrome (1312002131).

Subtracting from 1111001020 its reverse (201001111), we obtain a palindrome (909999909).

The spelling of 1111001020 in words is "one billion, one hundred eleven million, one thousand, twenty".