5711981 has 16 divisors (see below), whose sum is σ = 6594048. Its totient is φ = 4897200.

The previous prime is 5711971. The next prime is 5711987. The reversal of 5711981 is 1891175.

5711981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5711981 - 2⁶ = 5711917 is a prime.

It is a super-2 number, since 2×5711981² = 65253453888722, 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 (5711987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26966 + ... + 27176.

It is an arithmetic number, because the mean of its divisors is an integer number (412128).

Almost surely, 2^5711981 is an apocalyptic number.

It is an amenable number.

5711981 is a deficient number, since it is larger than the sum of its proper divisors (882067).

5711981 is a wasteful number, since it uses less digits than its factorization.

5711981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its digits is 2520, while the sum is 32.

The square root of 5711981 is about 2389.9751044728. The cubic root of 5711981 is about 178.7566682110.

It can be divided in two parts, 571 and 1981, that added together give a palindrome (2552).

The spelling of 5711981 in words is "five million, seven hundred eleven thousand, nine hundred eighty-one".