1275388649 has 4 divisors (see below), whose sum is σ = 1276931664. Its totient is φ = 1273845636.

The previous prime is 1275388627. The next prime is 1275388669. The reversal of 1275388649 is 9468835721.

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 a cyclic number.

It is not a de Polignac number, because 1275388649 - 2⁸ = 1275388393 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 1275388649.

It is not an unprimeable number, because it can be changed into a prime (1275388619) 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, 770267 + ... + 771920.

It is an arithmetic number, because the mean of its divisors is an integer number (319232916).

Almost surely, 2^1275388649 is an apocalyptic number.

It is an amenable number.

1275388649 is a deficient number, since it is larger than the sum of its proper divisors (1543015).

1275388649 is an equidigital number, since it uses as much as digits as its factorization.

1275388649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543014.

The product of its digits is 2903040, while the sum is 53.

The square root of 1275388649 is about 35712.5839025966. The cubic root of 1275388649 is about 1084.4616097598.

The spelling of 1275388649 in words is "one billion, two hundred seventy-five million, three hundred eighty-eight thousand, six hundred forty-nine".