1013781 has 8 divisors (see below), whose sum is σ = 1359904. Its totient is φ = 671760.

The previous prime is 1013773. The next prime is 1013791. The reversal of 1013781 is 1873101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1013781 - 2³ = 1013773 is a prime.

It is a super-2 number, since 2×1013781² = 2055503831922, which contains 22 as substring.

It is a Duffinian number.

1013781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013711) 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 7 ways as a sum of consecutive naturals, for example, 391 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (169988).

2^1013781 is an apocalyptic number.

It is an amenable number.

1013781 is a deficient number, since it is larger than the sum of its proper divisors (346123).

1013781 is a wasteful number, since it uses less digits than its factorization.

1013781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 1013781 is about 1006.8669226864. The cubic root of 1013781 is about 100.4572724981.

Adding to 1013781 its reverse (1873101), we get a palindrome (2886882).

The spelling of 1013781 in words is "one million, thirteen thousand, seven hundred eighty-one".