1261081284 has 48 divisors (see below), whose sum is σ = 3120364800. Its totient is φ = 395030016.

The previous prime is 1261081259. The next prime is 1261081291. The reversal of 1261081284 is 4821801621.

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 15 ways as a sum of consecutive naturals, for example, 140277 + ... + 148995.

It is an arithmetic number, because the mean of its divisors is an integer number (65007600).

Almost surely, 2^1261081284 is an apocalyptic number.

It is an amenable number.

1261081284 is an abundant number, since it is smaller than the sum of its proper divisors (1859283516).

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

1261081284 is a wasteful number, since it uses less digits than its factorization.

1261081284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9452 (or 9450 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1261081284 is about 35511.7062952486. The cubic root of 1261081284 is about 1080.3911717451.

The spelling of 1261081284 in words is "one billion, two hundred sixty-one million, eighty-one thousand, two hundred eighty-four".