1111221131 has 4 divisors (see below), whose sum is σ = 1111958064. Its totient is φ = 1110484200.

The previous prime is 1111221119. The next prime is 1111221157. The reversal of 1111221131 is 1311221111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111221131 is a prime.

It is a super-2 number, since 2×1111221131² = 2469624803961838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111224131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366200 + ... + 369221.

It is an arithmetic number, because the mean of its divisors is an integer number (277989516).

Almost surely, 2^1111221131 is an apocalyptic number.

1111221131 is a deficient number, since it is larger than the sum of its proper divisors (736933).

1111221131 is an equidigital number, since it uses as much as digits as its factorization.

1111221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736932.

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

The square root of 1111221131 is about 33334.9835908164. The cubic root of 1111221131 is about 1035.7783532605.

Adding to 1111221131 its reverse (1311221111), we get a palindrome (2422442242).

The spelling of 1111221131 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred thirty-one".