1215645323 has 4 divisors (see below), whose sum is σ = 1248500640. Its totient is φ = 1182790008.

The previous prime is 1215645317. The next prime is 1215645341. The reversal of 1215645323 is 3235465121.

It is a happy number.

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 1215645323 - 2²⁴ = 1198868107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215645323.

It is not an unprimeable number, because it can be changed into a prime (1215645373) 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, 16427603 + ... + 16427676.

It is an arithmetic number, because the mean of its divisors is an integer number (312125160).

Almost surely, 2^1215645323 is an apocalyptic number.

1215645323 is a deficient number, since it is larger than the sum of its proper divisors (32855317).

1215645323 is an equidigital number, since it uses as much as digits as its factorization.

1215645323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32855316.

The product of its digits is 21600, while the sum is 32.

The square root of 1215645323 is about 34866.1056471755. The cubic root of 1215645323 is about 1067.2568751991.

The spelling of 1215645323 in words is "one billion, two hundred fifteen million, six hundred forty-five thousand, three hundred twenty-three".