87481 has 2 divisors, whose sum is σ = 87482. Its totient is φ = 87480.

The previous prime is 87473. The next prime is 87491. The reversal of 87481 is 18478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 19881 = 260^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 87481 - 2³ = 87473 is a prime.

It is a super-2 number, since 2×87481² = 15305850722, which contains 22 as substring.

87481 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (87421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43740 + 43741.

It is an arithmetic number, because the mean of its divisors is an integer number (43741).

2⁸⁷⁴⁸¹ is an apocalyptic number.

It is an amenable number.

87481 is a deficient number, since it is larger than the sum of its proper divisors (1).

87481 is an equidigital number, since it uses as much as digits as its factorization.

87481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

The square root of 87481 is about 295.7718715497. The cubic root of 87481 is about 44.3919864877.

The spelling of 87481 in words is "eighty-seven thousand, four hundred eighty-one".