1011809868 has 48 divisors (see below), whose sum is σ = 2445628416. Its totient is φ = 325241280.

The previous prime is 1011809863. The next prime is 1011809873. The reversal of 1011809868 is 8689081101.

It is an interprime number because it is at equal distance from previous prime (1011809863) and next prime (1011809873).

It is not an unprimeable number, because it can be changed into a prime (1011809861) 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, 104355 + ... + 113637.

It is an arithmetic number, because the mean of its divisors is an integer number (50950592).

Almost surely, 2^1011809868 is an apocalyptic number.

It is an amenable number.

1011809868 is an abundant number, since it is smaller than the sum of its proper divisors (1433818548).

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

1011809868 is a wasteful number, since it uses less digits than its factorization.

1011809868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9614 (or 9612 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 42.

The square root of 1011809868 is about 31808.9589266923. The cubic root of 1011809868 is about 1003.9212265514.

The spelling of 1011809868 in words is "one billion, eleven million, eight hundred nine thousand, eight hundred sixty-eight".