1011091820 has 12 divisors (see below), whose sum is σ = 2123292864. Its totient is φ = 404436720.

The previous prime is 1011091817. The next prime is 1011091843. The reversal of 1011091820 is 281901101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25277276 + ... + 25277315.

It is an arithmetic number, because the mean of its divisors is an integer number (176941072).

Almost surely, 2^1011091820 is an apocalyptic number.

1011091820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011091820 is an abundant number, since it is smaller than the sum of its proper divisors (1112201044).

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

1011091820 is a wasteful number, since it uses less digits than its factorization.

1011091820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50554600 (or 50554598 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 1011091820 is about 31797.6700404291. The cubic root of 1011091820 is about 1003.6836871205.

Adding to 1011091820 its reverse (281901101), we get a palindrome (1292992921).

The spelling of 1011091820 in words is "one billion, eleven million, ninety-one thousand, eight hundred twenty".