267791261 has 2 divisors, whose sum is σ = 267791262. Its totient is φ = 267791260.

The previous prime is 267791239. The next prime is 267791273. The reversal of 267791261 is 162197762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264062500 + 3728761 = 16250^2 + 1931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-267791261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (267791201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133895630 + 133895631.

It is an arithmetic number, because the mean of its divisors is an integer number (133895631).

Almost surely, 2^267791261 is an apocalyptic number.

It is an amenable number.

267791261 is a deficient number, since it is larger than the sum of its proper divisors (1).

267791261 is an equidigital number, since it uses as much as digits as its factorization.

267791261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 267791261 is about 16364.3289199405. The cubic root of 267791261 is about 644.5631406736.

The spelling of 267791261 in words is "two hundred sixty-seven million, seven hundred ninety-one thousand, two hundred sixty-one".