1055781 has 8 divisors (see below), whose sum is σ = 1564160. Its totient is φ = 703836.

The previous prime is 1055771. The next prime is 1055783. The reversal of 1055781 is 1875501.

It is not a de Polignac number, because 1055781 - 2⁹ = 1055269 is a prime.

It is a super-2 number, since 2×1055781² = 2229347039922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 39103 = 1055781 / (1 + 0 + 5 + 5 + 7 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19525 + ... + 19578.

It is an arithmetic number, because the mean of its divisors is an integer number (195520).

2^1055781 is an apocalyptic number.

It is an amenable number.

1055781 is a deficient number, since it is larger than the sum of its proper divisors (508379).

1055781 is an equidigital number, since it uses as much as digits as its factorization.

1055781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39112 (or 39106 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 1055781 is about 1027.5120437250. The cubic root of 1055781 is about 101.8258273238.

It can be divided in two parts, 105 and 5781, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 1055781 in words is "one million, fifty-five thousand, seven hundred eighty-one".