1215664222 has 4 divisors (see below), whose sum is σ = 1823496336. Its totient is φ = 607832110.

The previous prime is 1215664217. The next prime is 1215664243. The reversal of 1215664222 is 2224665121.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303916054 + ... + 303916057.

It is an arithmetic number, because the mean of its divisors is an integer number (455874084).

Almost surely, 2^1215664222 is an apocalyptic number.

1215664222 is a deficient number, since it is larger than the sum of its proper divisors (607832114).

1215664222 is an equidigital number, since it uses as much as digits as its factorization.

1215664222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607832113.

The product of its digits is 11520, while the sum is 31.

The square root of 1215664222 is about 34866.3766686474. The cubic root of 1215664222 is about 1067.2624058646.

The spelling of 1215664222 in words is "one billion, two hundred fifteen million, six hundred sixty-four thousand, two hundred twenty-two".