276481 has 4 divisors (see below), whose sum is σ = 278464. Its totient is φ = 274500.

The previous prime is 276467. The next prime is 276487. The reversal of 276481 is 184672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 276481 - 2⁵ = 276449 is a prime.

It is a super-2 number, since 2×276481² = 152883486722, which contains 22 as substring.

It is a Duffinian number.

276481 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (276487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765 + ... + 1066.

It is an arithmetic number, because the mean of its divisors is an integer number (69616).

It is a Proth number, since it is equal to 135 ⋅ 2¹¹ + 1 and 135 < 2¹¹.

2²⁷⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

276481 is a deficient number, since it is larger than the sum of its proper divisors (1983).

276481 is a wasteful number, since it uses less digits than its factorization.

276481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its digits is 2688, while the sum is 28.

The square root of 276481 is about 525.8146061113. The cubic root of 276481 is about 65.1461013404.

Subtracting from 276481 its reverse (184672), we obtain a square (91809 = 303²).

It can be divided in two parts, 276 and 481, that added together give a palindrome (757).

The spelling of 276481 in words is "two hundred seventy-six thousand, four hundred eighty-one".