1091839867 has 2 divisors, whose sum is σ = 1091839868. Its totient is φ = 1091839866.

The previous prime is 1091839843. The next prime is 1091839891. The reversal of 1091839867 is 7689381901.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1091839843) and next prime (1091839891).

It is a cyclic number.

It is not a de Polignac number, because 1091839867 - 2¹⁹ = 1091315579 is a prime.

It is a super-2 number, since 2×1091839867² = 2384228590341155378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1091839367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545919933 + 545919934.

It is an arithmetic number, because the mean of its divisors is an integer number (545919934).

Almost surely, 2^1091839867 is an apocalyptic number.

1091839867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091839867 is an equidigital number, since it uses as much as digits as its factorization.

1091839867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1091839867 is about 33043.0002723724. Note that the first 3 decimals coincide. The cubic root of 1091839867 is about 1029.7211885563.

The spelling of 1091839867 in words is "one billion, ninety-one million, eight hundred thirty-nine thousand, eight hundred sixty-seven".