1216216526 has 8 divisors (see below), whose sum is σ = 2084942640. Its totient is φ = 521235648.

The previous prime is 1216216483. The next prime is 1216216571. The reversal of 1216216526 is 6256126121.

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

It is a junction number, because it is equal to n+sod(n) for n = 1216216492 and 1216216501.

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, 43436291 + ... + 43436318.

It is an arithmetic number, because the mean of its divisors is an integer number (260617830).

Almost surely, 2^1216216526 is an apocalyptic number.

1216216526 is a deficient number, since it is larger than the sum of its proper divisors (868726114).

1216216526 is an equidigital number, since it uses as much as digits as its factorization.

1216216526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86872618.

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

The square root of 1216216526 is about 34874.2960645803. The cubic root of 1216216526 is about 1067.4240086165.

The spelling of 1216216526 in words is "one billion, two hundred sixteen million, two hundred sixteen thousand, five hundred twenty-six".