1261088916 has 24 divisors (see below), whose sum is σ = 2962293600. Its totient is φ = 417541152.

The previous prime is 1261088903. The next prime is 1261088953. The reversal of 1261088916 is 6198801621.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 350866 + ... + 354441.

It is an arithmetic number, because the mean of its divisors is an integer number (123428900).

Almost surely, 2^1261088916 is an apocalyptic number.

It is an amenable number.

1261088916 is an abundant number, since it is smaller than the sum of its proper divisors (1701204684).

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

1261088916 is a wasteful number, since it uses less digits than its factorization.

1261088916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705463 (or 705461 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1261088916 is about 35511.8137526091. The cubic root of 1261088916 is about 1080.3933512316.

The spelling of 1261088916 in words is "one billion, two hundred sixty-one million, eighty-eight thousand, nine hundred sixteen".