1091619109 has 16 divisors (see below), whose sum is σ = 1277971200. Its totient is φ = 932038800.

The previous prime is 1091619097. The next prime is 1091619143. The reversal of 1091619109 is 9019161901.

It is not a de Polignac number, because 1091619109 - 2¹³ = 1091610917 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091619209) 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, 84159 + ... + 96259.

It is an arithmetic number, because the mean of its divisors is an integer number (79873200).

Almost surely, 2^1091619109 is an apocalyptic number.

It is an amenable number.

1091619109 is a deficient number, since it is larger than the sum of its proper divisors (186352091).

1091619109 is an equidigital number, since it uses as much as digits as its factorization.

1091619109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12385 (or 12371 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 37.

The square root of 1091619109 is about 33039.6596380774. The cubic root of 1091619109 is about 1029.6517844494.

The spelling of 1091619109 in words is "one billion, ninety-one million, six hundred nineteen thousand, one hundred nine".