1080781 has 4 divisors (see below), whose sum is σ = 1163932. Its totient is φ = 997632.

The previous prime is 1080773. The next prime is 1080787. The reversal of 1080781 is 1870801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 1010025 = 266^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1080781 - 2³ = 1080773 is a prime.

It is a super-2 number, since 2×1080781² = 2336175139922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1080787) 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, 41556 + ... + 41581.

It is an arithmetic number, because the mean of its divisors is an integer number (290983).

2^1080781 is an apocalyptic number.

It is an amenable number.

1080781 is a deficient number, since it is larger than the sum of its proper divisors (83151).

1080781 is an equidigital number, since it uses as much as digits as its factorization.

1080781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83150.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 1080781 is about 1039.6061754338. The cubic root of 1080781 is about 102.6232821603.

The spelling of 1080781 in words is "one million, eighty thousand, seven hundred eighty-one".