276721 has 2 divisors, whose sum is σ = 276722. Its totient is φ = 276720.

The previous prime is 276707. The next prime is 276739. The reversal of 276721 is 127672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 69696 = 455^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 276721 - 2⁷ = 276593 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (276781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138360 + 138361.

It is an arithmetic number, because the mean of its divisors is an integer number (138361).

2²⁷⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

276721 is a deficient number, since it is larger than the sum of its proper divisors (1).

276721 is an equidigital number, since it uses as much as digits as its factorization.

276721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 25.

The square root of 276721 is about 526.0427739262. The cubic root of 276721 is about 65.1649459656.

The spelling of 276721 in words is "two hundred seventy-six thousand, seven hundred twenty-one".