6401813 has 4 divisors (see below), whose sum is σ = 6983808. Its totient is φ = 5819820.

The previous prime is 6401771. The next prime is 6401827. The reversal of 6401813 is 3181046.

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.

It is a cyclic number.

It is not a de Polignac number, because 6401813 - 2⁶ = 6401749 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 (6401893) 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, 290981 + ... + 291002.

It is an arithmetic number, because the mean of its divisors is an integer number (1745952).

Almost surely, 2^6401813 is an apocalyptic number.

It is an amenable number.

6401813 is a deficient number, since it is larger than the sum of its proper divisors (581995).

6401813 is a wasteful number, since it uses less digits than its factorization.

6401813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581994.

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

The square root of 6401813 is about 2530.1804283489. The cubic root of 6401813 is about 185.6810833571.

Adding to 6401813 its reverse (3181046), we get a palindrome (9582859).

The spelling of 6401813 in words is "six million, four hundred one thousand, eight hundred thirteen".