2057381 has 2 divisors, whose sum is σ = 2057382.
Its totient is φ = 2057380.
The previous prime is 2057371. The next prime is 2057383. The reversal of 2057381 is 1837502.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1934881 + 122500 = 1391^2 + 350^2
It is a cyclic number.
It is not a de Polignac number, because 2057381 - 26 = 2057317 is a prime.
It is a super-2 number, since 2×20573812 = 8465633158322, which contains 22 as substring.
Together with 2057383, it forms a pair of twin primes.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 2057381.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2057383) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028690 + 1028691.
It is an arithmetic number, because the mean of its divisors is an integer number (1028691).
22057381 is an apocalyptic number.
It is an amenable number.
2057381 is a deficient number, since it is larger than the sum of its proper divisors (1).
2057381 is an equidigital number, since it uses as much as digits as its factorization.
2057381 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 1680, while the sum is 26.
The square root of 2057381 is about 1434.3573473859.
The cubic root of 2057381 is about 127.1856874117.
The spelling of 2057381 in words is "two million, fifty-seven thousand, three hundred eighty-one".