1028311609291 has 4 divisors (see below), whose sum is σ = 1028384517112. Its totient is φ = 1028238701472.

The previous prime is 1028311609279. The next prime is 1028311609307. The reversal of 1028311609291 is 1929061138201.

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

It is a cyclic number.

It is not a de Polignac number, because 1028311609291 - 2⁷ = 1028311609163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028311609201) 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, 36432750 + ... + 36460963.

It is an arithmetic number, because the mean of its divisors is an integer number (257096129278).

Almost surely, 2^{1028311609291} is an apocalyptic number.

1028311609291 is a deficient number, since it is larger than the sum of its proper divisors (72907821).

1028311609291 is an equidigital number, since it uses as much as digits as its factorization.

1028311609291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72907820.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 1028311609291 in words is "one trillion, twenty-eight billion, three hundred eleven million, six hundred nine thousand, two hundred ninety-one".