1053781 has 4 divisors (see below), whose sum is σ = 1067200. Its totient is φ = 1040364.

The previous prime is 1053769. The next prime is 1053809. The reversal of 1053781 is 1873501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1873501 = 7 ⋅267643.

It is a cyclic number.

It is not a de Polignac number, because 1053781 - 2⁵ = 1053749 is a prime.

It is a super-2 number, since 2×1053781² = 2220908791922, 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 (1053181) 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 3 ways as a sum of consecutive naturals, for example, 6591 + ... + 6748.

It is an arithmetic number, because the mean of its divisors is an integer number (266800).

2^1053781 is an apocalyptic number.

It is an amenable number.

1053781 is a deficient number, since it is larger than the sum of its proper divisors (13419).

1053781 is an equidigital number, since it uses as much as digits as its factorization.

1053781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13418.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1053781 is about 1026.5383577831. The cubic root of 1053781 is about 101.7614893646.

The spelling of 1053781 in words is "one million, fifty-three thousand, seven hundred eighty-one".