1131221223 has 36 divisors (see below), whose sum is σ = 1799837208. Its totient is φ = 678973440.

The previous prime is 1131221209. The next prime is 1131221237. The reversal of 1131221223 is 3221221311.

It is an interprime number because it is at equal distance from previous prime (1131221209) and next prime (1131221237).

It is not a de Polignac number, because 1131221223 - 2⁶ = 1131221159 is a prime.

It is a super-2 number, since 2×1131221223² = 2559322910731231458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131221196 and 1131221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131221023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4401511 + ... + 4401767.

It is an arithmetic number, because the mean of its divisors is an integer number (49995478).

Almost surely, 2^1131221223 is an apocalyptic number.

1131221223 is a deficient number, since it is larger than the sum of its proper divisors (668615985).

1131221223 is a wasteful number, since it uses less digits than its factorization.

1131221223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 444 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1131221223 is about 33633.6323194507. The cubic root of 1131221223 is about 1041.9555240416.

Adding to 1131221223 its reverse (3221221311), we get a palindrome (4352442534).

The spelling of 1131221223 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-three".