1042091665 has 4 divisors (see below), whose sum is σ = 1250510004. Its totient is φ = 833673328.

The previous prime is 1042091663. The next prime is 1042091683. The reversal of 1042091665 is 5661902401.

1042091665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661902401 = 751 ⋅7539151.

It can be written as a sum of positive squares in 2 ways, for example, as 682306641 + 359785024 = 26121^2 + 18968^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042091665 - 2¹ = 1042091663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1042091665.

It is not an unprimeable number, because it can be changed into a prime (1042091663) 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, 104209162 + ... + 104209171.

It is an arithmetic number, because the mean of its divisors is an integer number (312627501).

Almost surely, 2^1042091665 is an apocalyptic number.

It is an amenable number.

1042091665 is a deficient number, since it is larger than the sum of its proper divisors (208418339).

1042091665 is an equidigital number, since it uses as much as digits as its factorization.

1042091665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208418338.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1042091665 is about 32281.4445928307. Note that the first 3 decimals coincide. The cubic root of 1042091665 is about 1013.8381765552.

The spelling of 1042091665 in words is "one billion, forty-two million, ninety-one thousand, six hundred sixty-five".