1275621667 has 2 divisors, whose sum is σ = 1275621668. Its totient is φ = 1275621666.

The previous prime is 1275621647. The next prime is 1275621671. The reversal of 1275621667 is 7661265721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1275621667 - 2¹⁹ = 1275097379 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275621647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637810833 + 637810834.

It is an arithmetic number, because the mean of its divisors is an integer number (637810834).

Almost surely, 2^1275621667 is an apocalyptic number.

1275621667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275621667 is an equidigital number, since it uses as much as digits as its factorization.

1275621667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 1275621667 is about 35715.8461610529. The cubic root of 1275621667 is about 1084.5276507238.

The spelling of 1275621667 in words is "one billion, two hundred seventy-five million, six hundred twenty-one thousand, six hundred sixty-seven".