1216536231 has 8 divisors (see below), whose sum is σ = 1626135664. Its totient is φ = 808980480.

The previous prime is 1216536221. The next prime is 1216536239. The reversal of 1216536231 is 1326356121.

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

It is not a de Polignac number, because 1216536231 - 2⁷ = 1216536103 is a prime.

It is a super-2 number, since 2×1216536231² = 2959920802671370722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216536239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509530 + ... + 511911.

It is an arithmetic number, because the mean of its divisors is an integer number (203266958).

Almost surely, 2^1216536231 is an apocalyptic number.

1216536231 is a deficient number, since it is larger than the sum of its proper divisors (409599433).

1216536231 is a wasteful number, since it uses less digits than its factorization.

1216536231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021841.

The product of its digits is 6480, while the sum is 30.

The square root of 1216536231 is about 34878.8794401426. The cubic root of 1216536231 is about 1067.5175311342.

The spelling of 1216536231 in words is "one billion, two hundred sixteen million, five hundred thirty-six thousand, two hundred thirty-one".