781441 has 4 divisors (see below), whose sum is σ = 786132. Its totient is φ = 776752.

The previous prime is 781433. The next prime is 781453. The reversal of 781441 is 144187.

781441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144187 = 23 ⋅6269.

It can be written as a sum of positive squares in 2 ways, for example, as 297025 + 484416 = 545^2 + 696^2 .

It is a cyclic number.

It is not a de Polignac number, because 781441 - 2³ = 781433 is a prime.

It is a super-2 number, since 2×781441² = 1221300072962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781481) 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, 2086 + ... + 2431.

It is an arithmetic number, because the mean of its divisors is an integer number (196533).

2⁷⁸¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

781441 is a deficient number, since it is larger than the sum of its proper divisors (4691).

781441 is a wasteful number, since it uses less digits than its factorization.

781441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4690.

The product of its digits is 896, while the sum is 25.

The square root of 781441 is about 883.9915157964. The cubic root of 781441 is about 92.1082924546.

The spelling of 781441 in words is "seven hundred eighty-one thousand, four hundred forty-one".