1091381219 has 4 divisors (see below), whose sum is σ = 1114602144. Its totient is φ = 1068160296.

The previous prime is 1091381201. The next prime is 1091381243. The reversal of 1091381219 is 9121831901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1091381219 - 2⁸ = 1091380963 is a prime.

It is a super-2 number, since 2×1091381219² = 2382225930371851922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091381519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11610392 + ... + 11610485.

It is an arithmetic number, because the mean of its divisors is an integer number (278650536).

Almost surely, 2^1091381219 is an apocalyptic number.

1091381219 is a deficient number, since it is larger than the sum of its proper divisors (23220925).

1091381219 is an equidigital number, since it uses as much as digits as its factorization.

1091381219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23220924.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 1091381219 is about 33036.0593745683. The cubic root of 1091381219 is about 1029.5769837379.

The spelling of 1091381219 in words is "one billion, ninety-one million, three hundred eighty-one thousand, two hundred nineteen".