1131211121 has 8 divisors (see below), whose sum is σ = 1148587200. Its totient is φ = 1113875280.

The previous prime is 1131211117. The next prime is 1131211153. The reversal of 1131211121 is 1211121311.

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 1131211121 - 2² = 1131211117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131211096 and 1131211105.

It is not an unprimeable number, because it can be changed into a prime (1131214121) 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, 49250 + ... + 68468.

It is an arithmetic number, because the mean of its divisors is an integer number (143573400).

Almost surely, 2^1131211121 is an apocalyptic number.

It is an amenable number.

1131211121 is a deficient number, since it is larger than the sum of its proper divisors (17376079).

1131211121 is an equidigital number, since it uses as much as digits as its factorization.

1131211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20119.

The product of its digits is 12, while the sum is 14.

The square root of 1131211121 is about 33633.4821420560. The cubic root of 1131211121 is about 1041.9524224184.

Adding to 1131211121 its reverse (1211121311), we get a palindrome (2342332432).

The spelling of 1131211121 in words is "one billion, one hundred thirty-one million, two hundred eleven thousand, one hundred twenty-one".