1121781711 has 8 divisors (see below), whose sum is σ = 1502798464. Its totient is φ = 744309720.

The previous prime is 1121781701. The next prime is 1121781733. The reversal of 1121781711 is 1171871211.

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

It is not a de Polignac number, because 1121781711 - 2¹³ = 1121773519 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 (1121781701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885451 + ... + 886716.

It is an arithmetic number, because the mean of its divisors is an integer number (187849808).

Almost surely, 2^1121781711 is an apocalyptic number.

1121781711 is a deficient number, since it is larger than the sum of its proper divisors (381016753).

1121781711 is a wasteful number, since it uses less digits than its factorization.

1121781711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772381.

The product of its digits is 784, while the sum is 30.

The square root of 1121781711 is about 33493.0098826606. The cubic root of 1121781711 is about 1039.0492145591.

The spelling of 1121781711 in words is "one billion, one hundred twenty-one million, seven hundred eighty-one thousand, seven hundred eleven".