1111212131 has 16 divisors (see below), whose sum is σ = 1180627200. Its totient is φ = 1042940448.

The previous prime is 1111212121. The next prime is 1111212203. The reversal of 1111212131 is 1312121111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111212131 is a prime.

It is a super-2 number, since 2×1111212131² = 2469584800163122322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1349786 + ... + 1350608.

It is an arithmetic number, because the mean of its divisors is an integer number (73789200).

Almost surely, 2^1111212131 is an apocalyptic number.

1111212131 is a deficient number, since it is larger than the sum of its proper divisors (69415069).

1111212131 is a wasteful number, since it uses less digits than its factorization.

1111212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418.

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

The square root of 1111212131 is about 33334.8485972263. The cubic root of 1111212131 is about 1035.7755569283.

Adding to 1111212131 its reverse (1312121111), we get a palindrome (2423333242).

The spelling of 1111212131 in words is "one billion, one hundred eleven million, two hundred twelve thousand, one hundred thirty-one".