1131222229 has 2 divisors, whose sum is σ = 1131222230. Its totient is φ = 1131222228.

The previous prime is 1131222221. The next prime is 1131222263. The reversal of 1131222229 is 9222221311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991935025 + 139287204 = 31495^2 + 11802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131222229 - 2³ = 1131222221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565611114 + 565611115.

It is an arithmetic number, because the mean of its divisors is an integer number (565611115).

Almost surely, 2^1131222229 is an apocalyptic number.

It is an amenable number.

1131222229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131222229 is an equidigital number, since it uses as much as digits as its factorization.

1131222229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 1131222229 is about 33633.6472747158. The cubic root of 1131222229 is about 1041.9558329134.

The spelling of 1131222229 in words is "one billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-nine".