1081921850 has 24 divisors (see below), whose sum is σ = 2081769660. Its totient is φ = 417845120.

The previous prime is 1081921843. The next prime is 1081921853. The reversal of 1081921850 is 581291801.

It can be written as a sum of positive squares in 6 ways, for example, as 169338169 + 912583681 = 13013^2 + 30209^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1081921850.

It is not an unprimeable number, because it can be changed into a prime (1081921853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371627 + ... + 374526.

Almost surely, 2^1081921850 is an apocalyptic number.

1081921850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1081921850 is a deficient number, since it is larger than the sum of its proper divisors (999847810).

1081921850 is a wasteful number, since it uses less digits than its factorization.

1081921850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746194 (or 746189 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 1081921850 is about 32892.5804703736. The cubic root of 1081921850 is about 1026.5937846494.

The spelling of 1081921850 in words is "one billion, eighty-one million, nine hundred twenty-one thousand, eight hundred fifty".