1191281485128 has 64 divisors (see below), whose sum is σ = 3438750725760. Its totient is φ = 336857204736.

The previous prime is 1191281485123. The next prime is 1191281485151. The reversal of 1191281485128 is 8215841821911.

It is not an unprimeable number, because it can be changed into a prime (1191281485123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36535051 + ... + 36567642.

It is an arithmetic number, because the mean of its divisors is an integer number (53730480090).

Almost surely, 2^{1191281485128} is an apocalyptic number.

It is an amenable number.

1191281485128 is an abundant number, since it is smaller than the sum of its proper divisors (2247469240632).

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

1191281485128 is a wasteful number, since it uses less digits than its factorization.

1191281485128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73102806 (or 73102802 counting only the distinct ones).

The product of its digits is 368640, while the sum is 51.

The spelling of 1191281485128 in words is "one trillion, one hundred ninety-one billion, two hundred eighty-one million, four hundred eighty-five thousand, one hundred twenty-eight".