1121956511 has 8 divisors (see below), whose sum is σ = 1219347360. Its totient is φ = 1026149472.

The previous prime is 1121956501. The next prime is 1121956529. The reversal of 1121956511 is 1156591211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121956511 - 2¹⁰ = 1121955487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121956501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394475 + ... + 397308.

It is an arithmetic number, because the mean of its divisors is an integer number (152418420).

Almost surely, 2^1121956511 is an apocalyptic number.

1121956511 is a deficient number, since it is larger than the sum of its proper divisors (97390849).

1121956511 is a wasteful number, since it uses less digits than its factorization.

1121956511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791905.

The product of its digits is 2700, while the sum is 32.

The square root of 1121956511 is about 33495.6192807358. The cubic root of 1121956511 is about 1039.1031811993.

The spelling of 1121956511 in words is "one billion, one hundred twenty-one million, nine hundred fifty-six thousand, five hundred eleven".