257481 has 24 divisors (see below), whose sum is σ = 438464. Its totient is φ = 142560.

The previous prime is 257473. The next prime is 257489. The reversal of 257481 is 184752.

It is an interprime number because it is at equal distance from previous prime (257473) and next prime (257489).

It is not a de Polignac number, because 257481 - 2³ = 257473 is a prime.

It is a super-2 number, since 2×257481² = 132592930722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3810 + ... + 3876.

2²⁵⁷⁴⁸¹ is an apocalyptic number.

257481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

257481 is a deficient number, since it is larger than the sum of its proper divisors (180983).

257481 is a wasteful number, since it uses less digits than its factorization.

257481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 138 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 257481 is about 507.4258566530. The cubic root of 257481 is about 63.6182515554.

The spelling of 257481 in words is "two hundred fifty-seven thousand, four hundred eighty-one".