1291612560 has 120 divisors (see below), whose sum is σ = 4657755456. Its totient is φ = 295223040.

The previous prime is 1291612537. The next prime is 1291612591. The reversal of 1291612560 is 652161921.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43156 + ... + 66675.

Almost surely, 2^1291612560 is an apocalyptic number.

1291612560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291612560 is an abundant number, since it is smaller than the sum of its proper divisors (3366142896).

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

1291612560 is a wasteful number, since it uses less digits than its factorization.

1291612560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109861 (or 109848 counting only the distinct ones).

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

The square root of 1291612560 is about 35939.0116725544. The cubic root of 1291612560 is about 1089.0406394704.

The spelling of 1291612560 in words is "one billion, two hundred ninety-one million, six hundred twelve thousand, five hundred sixty".