5681811 has 4 divisors (see below), whose sum is σ = 7575752. Its totient is φ = 3787872.

The previous prime is 5681803. The next prime is 5681861. The reversal of 5681811 is 1181865.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 5681811 - 2³ = 5681803 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5681861) 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, 946966 + ... + 946971.

It is an arithmetic number, because the mean of its divisors is an integer number (1893938).

Almost surely, 2^5681811 is an apocalyptic number.

5681811 is a deficient number, since it is larger than the sum of its proper divisors (1893941).

5681811 is a wasteful number, since it uses less digits than its factorization.

5681811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893940.

The product of its digits is 1920, while the sum is 30.

The square root of 5681811 is about 2383.6549666426. The cubic root of 5681811 is about 178.4413886925.

The spelling of 5681811 in words is "five million, six hundred eighty-one thousand, eight hundred eleven".