1081121899 has 24 divisors (see below), whose sum is σ = 1295253504. Its totient is φ = 894348000.

The previous prime is 1081121891. The next prime is 1081121911. The reversal of 1081121899 is 9981211801.

It is not a de Polignac number, because 1081121899 - 2³ = 1081121891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081121891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127894 + ... + 136084.

It is an arithmetic number, because the mean of its divisors is an integer number (53968896).

Almost surely, 2^1081121899 is an apocalyptic number.

1081121899 is a deficient number, since it is larger than the sum of its proper divisors (214131605).

1081121899 is a wasteful number, since it uses less digits than its factorization.

1081121899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8299 (or 8286 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 40.

The square root of 1081121899 is about 32880.4181694820. The cubic root of 1081121899 is about 1026.3407080811.

It can be divided in two parts, 108112 and 1899, that added together give a palindrome (110011).

The spelling of 1081121899 in words is "one billion, eighty-one million, one hundred twenty-one thousand, eight hundred ninety-nine".