1275216091 has 2 divisors, whose sum is σ = 1275216092. Its totient is φ = 1275216090.

The previous prime is 1275216083. The next prime is 1275216097. The reversal of 1275216091 is 1906125721.

It is a strong prime.

It is an emirp because it is prime and its reverse (1906125721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275216091 - 2³ = 1275216083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275216097) 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, 637608045 + 637608046.

It is an arithmetic number, because the mean of its divisors is an integer number (637608046).

Almost surely, 2^1275216091 is an apocalyptic number.

1275216091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275216091 is an equidigital number, since it uses as much as digits as its factorization.

1275216091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 1275216091 is about 35710.1678937526. The cubic root of 1275216091 is about 1084.4126989261.

The spelling of 1275216091 in words is "one billion, two hundred seventy-five million, two hundred sixteen thousand, ninety-one".