1275266217 has 4 divisors (see below), whose sum is σ = 1700354960. Its totient is φ = 850177476.

The previous prime is 1275266207. The next prime is 1275266219. The reversal of 1275266217 is 7126625721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7126625721 = 3 ⋅2375541907.

It is not a de Polignac number, because 1275266217 - 2⁸ = 1275265961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1275266219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212544367 + ... + 212544372.

It is an arithmetic number, because the mean of its divisors is an integer number (425088740).

Almost surely, 2^1275266217 is an apocalyptic number.

It is an amenable number.

1275266217 is a deficient number, since it is larger than the sum of its proper divisors (425088743).

1275266217 is an equidigital number, since it uses as much as digits as its factorization.

1275266217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425088742.

The product of its digits is 70560, while the sum is 39.

The square root of 1275266217 is about 35710.8697317777. The cubic root of 1275266217 is about 1084.4269073830.

The spelling of 1275266217 in words is "one billion, two hundred seventy-five million, two hundred sixty-six thousand, two hundred seventeen".