267521 has 2 divisors, whose sum is σ = 267522. Its totient is φ = 267520.

The previous prime is 267517. The next prime is 267523. The reversal of 267521 is 125762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 6400 = 511^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 267521 - 2² = 267517 is a prime.

Together with 267523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (267523) 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 as a sum of consecutive naturals, namely, 133760 + 133761.

It is an arithmetic number, because the mean of its divisors is an integer number (133761).

2²⁶⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

267521 is a deficient number, since it is larger than the sum of its proper divisors (1).

267521 is an equidigital number, since it uses as much as digits as its factorization.

267521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 267521 is about 517.2243227073. The cubic root of 267521 is about 64.4346231785.

The spelling of 267521 in words is "two hundred sixty-seven thousand, five hundred twenty-one".