1275643441 has 4 divisors (see below), whose sum is σ = 1275737584. Its totient is φ = 1275549300.

The previous prime is 1275643429. The next prime is 1275643463. The reversal of 1275643441 is 1443465721.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275643441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1275643441.

It is not an unprimeable number, because it can be changed into a prime (1275643471) 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 in 3 ways as a sum of consecutive naturals, for example, 22455 + ... + 55276.

It is an arithmetic number, because the mean of its divisors is an integer number (318934396).

Almost surely, 2^1275643441 is an apocalyptic number.

It is an amenable number.

1275643441 is a deficient number, since it is larger than the sum of its proper divisors (94143).

1275643441 is an equidigital number, since it uses as much as digits as its factorization.

1275643441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94142.

The product of its digits is 80640, while the sum is 37.

The square root of 1275643441 is about 35716.1509824337. The cubic root of 1275643441 is about 1084.5338214067.

The spelling of 1275643441 in words is "one billion, two hundred seventy-five million, six hundred forty-three thousand, four hundred forty-one".