1219139091 has 12 divisors (see below), whose sum is σ = 1821702480. Its totient is φ = 784733040.

The previous prime is 1219139087. The next prime is 1219139093. The reversal of 1219139091 is 1909319121.

It is not a de Polignac number, because 1219139091 - 2² = 1219139087 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1219139093) 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 11 ways as a sum of consecutive naturals, for example, 2335255 + ... + 2335776.

It is an arithmetic number, because the mean of its divisors is an integer number (151808540).

Almost surely, 2^1219139091 is an apocalyptic number.

1219139091 is a deficient number, since it is larger than the sum of its proper divisors (602563389).

1219139091 is a wasteful number, since it uses less digits than its factorization.

1219139091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671066 (or 4671063 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 1219139091 is about 34916.1723417674. The cubic root of 1219139091 is about 1068.2783303325.

The spelling of 1219139091 in words is "one billion, two hundred nineteen million, one hundred thirty-nine thousand, ninety-one".