6137981 has 2 divisors, whose sum is σ = 6137982. Its totient is φ = 6137980.

The previous prime is 6137959. The next prime is 6137993. The reversal of 6137981 is 1897316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5736025 + 401956 = 2395^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 6137981 - 2⁶ = 6137917 is a prime.

It is a super-2 number, since 2×6137981² = 75349621512722, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6137951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3068990 + 3068991.

It is an arithmetic number, because the mean of its divisors is an integer number (3068991).

Almost surely, 2^6137981 is an apocalyptic number.

It is an amenable number.

6137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6137981 is an equidigital number, since it uses as much as digits as its factorization.

6137981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 6137981 is about 2477.4949041320. The cubic root of 6137981 is about 183.0944499352.

The spelling of 6137981 in words is "six million, one hundred thirty-seven thousand, nine hundred eighty-one".