1267273121 has 2 divisors, whose sum is σ = 1267273122. Its totient is φ = 1267273120.

The previous prime is 1267273103. The next prime is 1267273123. The reversal of 1267273121 is 1213727621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246443025 + 20830096 = 35305^2 + 4564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267273121 - 2¹⁸ = 1267010977 is a prime.

Together with 1267273123, 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 (1267273123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633636560 + 633636561.

It is an arithmetic number, because the mean of its divisors is an integer number (633636561).

Almost surely, 2^1267273121 is an apocalyptic number.

It is an amenable number.

1267273121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267273121 is an equidigital number, since it uses as much as digits as its factorization.

1267273121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 1267273121 is about 35598.7797684134. The cubic root of 1267273121 is about 1082.1565052876.

The spelling of 1267273121 in words is "one billion, two hundred sixty-seven million, two hundred seventy-three thousand, one hundred twenty-one".