1276289849 has 4 divisors (see below), whose sum is σ = 1331780736. Its totient is φ = 1220798964.

The previous prime is 1276289827. The next prime is 1276289863. The reversal of 1276289849 is 9489826721.

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: 9489826721 = 971 ⋅9773251.

It is a cyclic number.

It is not a de Polignac number, because 1276289849 - 2¹² = 1276285753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1276289794 and 1276289803.

It is not an unprimeable number, because it can be changed into a prime (1276289549) 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, 27745409 + ... + 27745454.

It is an arithmetic number, because the mean of its divisors is an integer number (332945184).

Almost surely, 2^1276289849 is an apocalyptic number.

It is an amenable number.

1276289849 is a deficient number, since it is larger than the sum of its proper divisors (55490887).

1276289849 is an equidigital number, since it uses as much as digits as its factorization.

1276289849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55490886.

The product of its digits is 3483648, while the sum is 56.

The square root of 1276289849 is about 35725.1990757224. The cubic root of 1276289849 is about 1084.7169794205.

The spelling of 1276289849 in words is "one billion, two hundred seventy-six million, two hundred eighty-nine thousand, eight hundred forty-nine".