1121311111 has 8 divisors (see below), whose sum is σ = 1174234464. Its totient is φ = 1068735360.

The previous prime is 1121311097. The next prime is 1121311133. The reversal of 1121311111 is 1111131211.

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 1121311111 - 2²¹ = 1119213959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121311091 and 1121311100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121311141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80286 + ... + 93211.

It is an arithmetic number, because the mean of its divisors is an integer number (146779308).

Almost surely, 2^1121311111 is an apocalyptic number.

1121311111 is a deficient number, since it is larger than the sum of its proper divisors (52923353).

1121311111 is a wasteful number, since it uses less digits than its factorization.

1121311111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173801.

The product of its digits is 6, while the sum is 13.

The square root of 1121311111 is about 33485.9837991957. The cubic root of 1121311111 is about 1038.9038966396.

Adding to 1121311111 its reverse (1111131211), we get a palindrome (2232442322).

The spelling of 1121311111 in words is "one billion, one hundred twenty-one million, three hundred eleven thousand, one hundred eleven".