681413 has 4 divisors (see below), whose sum is σ = 704940. Its totient is φ = 657888.

The previous prime is 681409. The next prime is 681419. The reversal of 681413 is 314186.

681413 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.

It can be written as a sum of positive squares in 2 ways, for example, as 452929 + 228484 = 673^2 + 478^2 .

It is a cyclic number.

It is not a de Polignac number, because 681413 - 2² = 681409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681419) 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, 11720 + ... + 11777.

It is an arithmetic number, because the mean of its divisors is an integer number (176235).

2⁶⁸¹⁴¹³ is an apocalyptic number.

It is an amenable number.

681413 is a deficient number, since it is larger than the sum of its proper divisors (23527).

681413 is a wasteful number, since it uses less digits than its factorization.

681413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23526.

The product of its digits is 576, while the sum is 23.

The square root of 681413 is about 825.4774376081. The cubic root of 681413 is about 87.9974603262.

Adding to 681413 its reverse (314186), we get a palindrome (995599).

The spelling of 681413 in words is "six hundred eighty-one thousand, four hundred thirteen".