5917981 has 4 divisors (see below), whose sum is σ = 6062364. Its totient is φ = 5773600.

The previous prime is 5917963. The next prime is 5918009. The reversal of 5917981 is 1897195.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1897195 = 5 ⋅379439.

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 5134756 = 885^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 5917981 - 2¹³ = 5909789 is a prime.

It is a super-2 number, since 2×5917981² = 70044998232722, 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 (5917181) 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, 72130 + ... + 72211.

It is an arithmetic number, because the mean of its divisors is an integer number (1515591).

Almost surely, 2^5917981 is an apocalyptic number.

It is an amenable number.

5917981 is a deficient number, since it is larger than the sum of its proper divisors (144383).

5917981 is a wasteful number, since it uses less digits than its factorization.

5917981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144382.

The product of its digits is 22680, while the sum is 40.

The square root of 5917981 is about 2432.6900747937. The cubic root of 5917981 is about 180.8802663450.

The spelling of 5917981 in words is "five million, nine hundred seventeen thousand, nine hundred eighty-one".