1216261027 has 4 divisors (see below), whose sum is σ = 1233391536. Its totient is φ = 1199130520.

The previous prime is 1216261019. The next prime is 1216261043. The reversal of 1216261027 is 7201626121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7201626121 = 229 ⋅31448149.

It is a cyclic number.

It is not a de Polignac number, because 1216261027 - 2³ = 1216261019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216260986 and 1216261004.

It is not an unprimeable number, because it can be changed into a prime (1216261087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8565148 + ... + 8565289.

It is an arithmetic number, because the mean of its divisors is an integer number (308347884).

Almost surely, 2^1216261027 is an apocalyptic number.

1216261027 is a deficient number, since it is larger than the sum of its proper divisors (17130509).

1216261027 is an equidigital number, since it uses as much as digits as its factorization.

1216261027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17130508.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1216261027 is about 34874.9340787907. The cubic root of 1216261027 is about 1067.4370273664.

Adding to 1216261027 its reverse (7201626121), we get a palindrome (8417887148).

The spelling of 1216261027 in words is "one billion, two hundred sixteen million, two hundred sixty-one thousand, twenty-seven".