1223138309 has 2 divisors, whose sum is σ = 1223138310. Its totient is φ = 1223138308.

The previous prime is 1223138299. The next prime is 1223138317. The reversal of 1223138309 is 9038313221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1014422500 + 208715809 = 31850^2 + 14447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223138309 - 2²⁰ = 1222089733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223138339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611569154 + 611569155.

It is an arithmetic number, because the mean of its divisors is an integer number (611569155).

Almost surely, 2^1223138309 is an apocalyptic number.

It is an amenable number.

1223138309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223138309 is an equidigital number, since it uses as much as digits as its factorization.

1223138309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1223138309 is about 34973.3943019547. The cubic root of 1223138309 is about 1069.4451687226.

The spelling of 1223138309 in words is "one billion, two hundred twenty-three million, one hundred thirty-eight thousand, three hundred nine".