1261260276 has 12 divisors (see below), whose sum is σ = 2942940672. Its totient is φ = 420420088.

The previous prime is 1261260229. The next prime is 1261260317. The reversal of 1261260276 is 6720621621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52552500 + ... + 52552523.

It is an arithmetic number, because the mean of its divisors is an integer number (245245056).

Almost surely, 2^1261260276 is an apocalyptic number.

It is an amenable number.

1261260276 is an abundant number, since it is smaller than the sum of its proper divisors (1681680396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261260276 is a wasteful number, since it uses less digits than its factorization.

1261260276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105105030 (or 105105028 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1261260276 is about 35514.2263888713. The cubic root of 1261260276 is about 1080.4422845561.

Adding to 1261260276 its reverse (6720621621), we get a palindrome (7981881897).

The spelling of 1261260276 in words is "one billion, two hundred sixty-one million, two hundred sixty thousand, two hundred seventy-six".