1121649281172 has 72 divisors (see below), whose sum is σ = 3315676460096. Its totient is φ = 313018401024.

The previous prime is 1121649281153. The next prime is 1121649281189. The reversal of 1121649281172 is 2711829461211.

It is a happy number.

1121649281172 is a `hidden beast` number, since 1 + 1 + 2 + 16 + 492 + 81 + 1 + 72 = 666.

It is a congruent number.

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, 51744853 + ... + 51766524.

Almost surely, 2^{1121649281172} is an apocalyptic number.

1121649281172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1121649281172 is an abundant number, since it is smaller than the sum of its proper divisors (2194027178924).

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

1121649281172 is a wasteful number, since it uses less digits than its factorization.

1121649281172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103511437 (or 103511432 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The spelling of 1121649281172 in words is "one trillion, one hundred twenty-one billion, six hundred forty-nine million, two hundred eighty-one thousand, one hundred seventy-two".