1011111820 has 48 divisors (see below), whose sum is σ = 2146163040. Its totient is φ = 400121856.

The previous prime is 1011111797. The next prime is 1011111859. The reversal of 1011111820 is 281111101.

It is a super-2 number, since 2×1011111820² = 2044694225087424800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011111794 and 1011111803.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876364 + ... + 877516.

It is an arithmetic number, because the mean of its divisors is an integer number (44711730).

Almost surely, 2^1011111820 is an apocalyptic number.

1011111820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011111820 is an abundant number, since it is smaller than the sum of its proper divisors (1135051220).

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

1011111820 is a wasteful number, since it uses less digits than its factorization.

1011111820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

The square root of 1011111820 is about 31797.9845273250. The cubic root of 1011111820 is about 1003.6903048978.

Adding to 1011111820 its reverse (281111101), we get a palindrome (1292222921).

The spelling of 1011111820 in words is "one billion, eleven million, one hundred eleven thousand, eight hundred twenty".