1275720717 has 4 divisors (see below), whose sum is σ = 1700960960. Its totient is φ = 850480476.

The previous prime is 1275720713. The next prime is 1275720751. The reversal of 1275720717 is 7170275721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1275720717 - 2² = 1275720713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275720713) 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 in 3 ways as a sum of consecutive naturals, for example, 212620117 + ... + 212620122.

It is an arithmetic number, because the mean of its divisors is an integer number (425240240).

Almost surely, 2^1275720717 is an apocalyptic number.

It is an amenable number.

1275720717 is a deficient number, since it is larger than the sum of its proper divisors (425240243).

1275720717 is an equidigital number, since it uses as much as digits as its factorization.

1275720717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425240242.

The product of its (nonzero) digits is 48020, while the sum is 39.

The square root of 1275720717 is about 35717.2327735506. The cubic root of 1275720717 is about 1084.5557206148. Note that the first 3 decimals are identical.

The spelling of 1275720717 in words is "one billion, two hundred seventy-five million, seven hundred twenty thousand, seven hundred seventeen".