2057981 has 2 divisors, whose sum is σ = 2057982. Its totient is φ = 2057980.

The previous prime is 2057953. The next prime is 2057987. The reversal of 2057981 is 1897502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 828100 = 1109^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2057981 - 2⁶ = 2057917 is a prime.

It is a super-2 number, since 2×2057981² = 8470571592722, 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 (2057987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028990 + 1028991.

It is an arithmetic number, because the mean of its divisors is an integer number (1028991).

2^2057981 is an apocalyptic number.

It is an amenable number.

2057981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2057981 is an equidigital number, since it uses as much as digits as its factorization.

2057981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 2057981 is about 1434.5664850400. The cubic root of 2057981 is about 127.1980500538.

The spelling of 2057981 in words is "two million, fifty-seven thousand, nine hundred eighty-one".