1091423842 has 4 divisors (see below), whose sum is σ = 1637135766. Its totient is φ = 545711920.

The previous prime is 1091423833. The next prime is 1091423849. The reversal of 1091423842 is 2483241901.

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

It can be written as a sum of positive squares in only one way, i.e., 848032641 + 243391201 = 29121^2 + 15601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1091423798 and 1091423807.

It is not an unprimeable number, because it can be changed into a prime (1091423849) 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 as a sum of consecutive naturals, namely, 272855959 + ... + 272855962.

Almost surely, 2^1091423842 is an apocalyptic number.

1091423842 is a deficient number, since it is larger than the sum of its proper divisors (545711924).

1091423842 is an equidigital number, since it uses as much as digits as its factorization.

1091423842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545711923.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1091423842 is about 33036.7044663962. The cubic root of 1091423842 is about 1029.5903866588.

The spelling of 1091423842 in words is "one billion, ninety-one million, four hundred twenty-three thousand, eight hundred forty-two".