1261105296 has 80 divisors (see below), whose sum is σ = 3668717568. Its totient is φ = 369820800.

The previous prime is 1261105217. The next prime is 1261105303. The reversal of 1261105296 is 6925011621.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 22156 + ... + 54891.

Almost surely, 2^1261105296 is an apocalyptic number.

1261105296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261105296 is an abundant number, since it is smaller than the sum of its proper divisors (2407612272).

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

1261105296 is a wasteful number, since it uses less digits than its factorization.

1261105296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77100 (or 77094 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1261105296 is about 35512.0443793370. The cubic root of 1261105296 is about 1080.3980288733.

The spelling of 1261105296 in words is "one billion, two hundred sixty-one million, one hundred five thousand, two hundred ninety-six".