5831981 has 2 divisors, whose sum is σ = 5831982. Its totient is φ = 5831980.

The previous prime is 5831971. The next prime is 5831983. The reversal of 5831981 is 1891385.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5134756 + 697225 = 2266^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 5831981 - 2²² = 1637677 is a prime.

It is a super-2 number, since 2×5831981² = 68024004768722, which contains 22 as substring.

Together with 5831983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5831983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2915990 + 2915991.

It is an arithmetic number, because the mean of its divisors is an integer number (2915991).

Almost surely, 2^5831981 is an apocalyptic number.

It is an amenable number.

5831981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5831981 is an equidigital number, since it uses as much as digits as its factorization.

5831981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 5831981 is about 2414.9494818733. The cubic root of 5831981 is about 179.9998045265. Note that the first 3 decimals are identical.

The spelling of 5831981 in words is "five million, eight hundred thirty-one thousand, nine hundred eighty-one".