1078891 has 4 divisors (see below), whose sum is σ = 1176984. Its totient is φ = 980800.

The previous prime is 1078879. The next prime is 1078919. The reversal of 1078891 is 1988701.

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 1078891 - 2¹¹ = 1076843 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1078841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49030 + ... + 49051.

It is an arithmetic number, because the mean of its divisors is an integer number (294246).

2^1078891 is an apocalyptic number.

1078891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1078891 is a deficient number, since it is larger than the sum of its proper divisors (98093).

1078891 is an equidigital number, since it uses as much as digits as its factorization.

1078891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98092.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1078891 is about 1038.6967796234. The cubic root of 1078891 is about 102.5634269341.

It can be divided in two parts, 107 and 8891, that added together give a palindrome (8998).

The spelling of 1078891 in words is "one million, seventy-eight thousand, eight hundred ninety-one".