1275228649 has 4 divisors (see below), whose sum is σ = 1275307600. Its totient is φ = 1275149700.

The previous prime is 1275228641. The next prime is 1275228659. The reversal of 1275228649 is 9468225721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9468225721 = 823 ⋅11504527.

It is a cyclic number.

It is not a de Polignac number, because 1275228649 - 2³ = 1275228641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1275228599 and 1275228608.

It is not an unprimeable number, because it can be changed into a prime (1275228641) 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, 5499 + ... + 50800.

It is an arithmetic number, because the mean of its divisors is an integer number (318826900).

Almost surely, 2^1275228649 is an apocalyptic number.

It is an amenable number.

1275228649 is a deficient number, since it is larger than the sum of its proper divisors (78951).

1275228649 is an equidigital number, since it uses as much as digits as its factorization.

1275228649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78950.

The product of its digits is 483840, while the sum is 46.

The square root of 1275228649 is about 35710.3437255930. The cubic root of 1275228649 is about 1084.4162585868.

The spelling of 1275228649 in words is "one billion, two hundred seventy-five million, two hundred twenty-eight thousand, six hundred forty-nine".