1215643223 has 2 divisors, whose sum is σ = 1215643224. Its totient is φ = 1215643222.

The previous prime is 1215643217. The next prime is 1215643291. The reversal of 1215643223 is 3223465121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215643223 - 2¹⁰ = 1215642199 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215643213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607821611 + 607821612.

It is an arithmetic number, because the mean of its divisors is an integer number (607821612).

Almost surely, 2^1215643223 is an apocalyptic number.

1215643223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215643223 is an equidigital number, since it uses as much as digits as its factorization.

1215643223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 1215643223 is about 34866.0755319551. The cubic root of 1215643223 is about 1067.2562606446.

The spelling of 1215643223 in words is "one billion, two hundred fifteen million, six hundred forty-three thousand, two hundred twenty-three".