1211560128 has 42 divisors (see below), whose sum is σ = 3472720004. Its totient is φ = 403853184.

The previous prime is 1211560109. The next prime is 1211560151. The reversal of 1211560128 is 8210651121.

1211560128 is a `hidden beast` number, since 1 + 21 + 15 + 601 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1051126 + ... + 1052277.

Almost surely, 2^1211560128 is an apocalyptic number.

1211560128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1211560128 is an abundant number, since it is smaller than the sum of its proper divisors (2261159876).

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

1211560128 is a wasteful number, since it uses less digits than its factorization.

1211560128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103421 (or 2103408 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1211560128 is about 34807.4723012172. The cubic root of 1211560128 is about 1066.0600224103.

The spelling of 1211560128 in words is "one billion, two hundred eleven million, five hundred sixty thousand, one hundred twenty-eight".