1215656223 has 4 divisors (see below), whose sum is σ = 1620874968. Its totient is φ = 810437480.

The previous prime is 1215656219. The next prime is 1215656231. The reversal of 1215656223 is 3226565121.

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

It is a cyclic number.

It is not a de Polignac number, because 1215656223 - 2² = 1215656219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215656243) 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, 202609368 + ... + 202609373.

It is an arithmetic number, because the mean of its divisors is an integer number (405218742).

Almost surely, 2^1215656223 is an apocalyptic number.

1215656223 is a deficient number, since it is larger than the sum of its proper divisors (405218745).

1215656223 is an equidigital number, since it uses as much as digits as its factorization.

1215656223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405218744.

The product of its digits is 21600, while the sum is 33.

The square root of 1215656223 is about 34866.2619590916. The cubic root of 1215656223 is about 1067.2600650179.

The spelling of 1215656223 in words is "one billion, two hundred fifteen million, six hundred fifty-six thousand, two hundred twenty-three".