1042891085 has 4 divisors (see below), whose sum is σ = 1251469308. Its totient is φ = 834312864.

The previous prime is 1042891063. The next prime is 1042891103. The reversal of 1042891085 is 5801982401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5801982401 = 113 ⋅51344977.

It can be written as a sum of positive squares in 2 ways, for example, as 529506121 + 513384964 = 23011^2 + 22658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042891085 - 2¹⁰ = 1042890061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104289104 + ... + 104289113.

It is an arithmetic number, because the mean of its divisors is an integer number (312867327).

Almost surely, 2^1042891085 is an apocalyptic number.

It is an amenable number.

1042891085 is a deficient number, since it is larger than the sum of its proper divisors (208578223).

1042891085 is an equidigital number, since it uses as much as digits as its factorization.

1042891085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208578222.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1042891085 is about 32293.8242548014. The cubic root of 1042891085 is about 1014.0973589227.

The spelling of 1042891085 in words is "one billion, forty-two million, eight hundred ninety-one thousand, eighty-five".