2571381 has 6 divisors (see below), whose sum is σ = 3714230. Its totient is φ = 1714248.

The previous prime is 2571337. The next prime is 2571409. The reversal of 2571381 is 1831752.

It can be written as a sum of positive squares in only one way, i.e., 2452356 + 119025 = 1566^2 + 345^2 .

It is not a de Polignac number, because 2571381 - 2¹⁹ = 2047093 is a prime.

It is a super-2 number, since 2×2571381² = 13224000494322, 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 (2571181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142846 + ... + 142863.

2^2571381 is an apocalyptic number.

It is an amenable number.

2571381 is a deficient number, since it is larger than the sum of its proper divisors (1142849).

2571381 is a wasteful number, since it uses less digits than its factorization.

2571381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285715 (or 285712 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2571381 is about 1603.5526184070. The cubic root of 2571381 is about 137.0004972721. Note that the first 3 decimals are identical.

The spelling of 2571381 in words is "two million, five hundred seventy-one thousand, three hundred eighty-one".