1091896139 has 4 divisors (see below), whose sum is σ = 1129547760. Its totient is φ = 1054244520.

The previous prime is 1091896109. The next prime is 1091896171. The reversal of 1091896139 is 9316981901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9316981901 = 41 ⋅227243461.

It is a cyclic number.

It is not a de Polignac number, because 1091896139 - 2²⁸ = 823460683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1091896093 and 1091896102.

It is not an unprimeable number, because it can be changed into a prime (1091896109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18825767 + ... + 18825824.

It is an arithmetic number, because the mean of its divisors is an integer number (282386940).

Almost surely, 2^1091896139 is an apocalyptic number.

1091896139 is a deficient number, since it is larger than the sum of its proper divisors (37651621).

1091896139 is an equidigital number, since it uses as much as digits as its factorization.

1091896139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37651620.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1091896139 is about 33043.8517579292. The cubic root of 1091896139 is about 1029.7388784138.

The spelling of 1091896139 in words is "one billion, ninety-one million, eight hundred ninety-six thousand, one hundred thirty-nine".