5681257181 has 4 divisors (see below), whose sum is σ = 5690038752. Its totient is φ = 5672475612.

The previous prime is 5681257177. The next prime is 5681257187. The reversal of 5681257181 is 1817521865.

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 5681257181 - 2² = 5681257177 is a prime.

It is a super-2 number, since 2×5681257181² = 64553366313328133522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681257187) 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, 4389815 + ... + 4391108.

It is an arithmetic number, because the mean of its divisors is an integer number (1422509688).

Almost surely, 2^5681257181 is an apocalyptic number.

It is an amenable number.

5681257181 is a deficient number, since it is larger than the sum of its proper divisors (8781571).

5681257181 is an equidigital number, since it uses as much as digits as its factorization.

5681257181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8781570.

The product of its digits is 134400, while the sum is 44.

The square root of 5681257181 is about 75374.1147941387. The cubic root of 5681257181 is about 1784.3559080858.

The spelling of 5681257181 in words is "five billion, six hundred eighty-one million, two hundred fifty-seven thousand, one hundred eighty-one".