1216561622 has 8 divisors (see below), whose sum is σ = 1826470776. Its totient is φ = 607738032.

The previous prime is 1216561603. The next prime is 1216561631. The reversal of 1216561622 is 2261656121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268583 + ... + 273074.

It is an arithmetic number, because the mean of its divisors is an integer number (228308847).

Almost surely, 2^1216561622 is an apocalyptic number.

1216561622 is a deficient number, since it is larger than the sum of its proper divisors (609909154).

1216561622 is a wasteful number, since it uses less digits than its factorization.

1216561622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542782.

The product of its digits is 8640, while the sum is 32.

The square root of 1216561622 is about 34879.2434264277. The cubic root of 1216561622 is about 1067.5249579987.

The spelling of 1216561622 in words is "one billion, two hundred sixteen million, five hundred sixty-one thousand, six hundred twenty-two".