1091809970 has 8 divisors (see below), whose sum is σ = 1965257964. Its totient is φ = 436723984.

The previous prime is 1091809969. The next prime is 1091809993. The reversal of 1091809970 is 799081901.

It can be written as a sum of positive squares in 2 ways, for example, as 1085900209 + 5909761 = 32953^2 + 2431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54590489 + ... + 54590508.

Almost surely, 2^1091809970 is an apocalyptic number.

1091809970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1091809970 is a deficient number, since it is larger than the sum of its proper divisors (873447994).

1091809970 is a wasteful number, since it uses less digits than its factorization.

1091809970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109181004.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 1091809970 is about 33042.5478739155. The cubic root of 1091809970 is about 1029.7117897862.

The spelling of 1091809970 in words is "one billion, ninety-one million, eight hundred nine thousand, nine hundred seventy".