1216627101 has 16 divisors (see below), whose sum is σ = 1840761600. Its totient is φ = 793826784.

The previous prime is 1216627099. The next prime is 1216627109. The reversal of 1216627101 is 1017266121.

It is a happy number.

1216627101 is a `hidden beast` number, since 1 + 21 + 6 + 627 + 10 + 1 = 666.

It is not a de Polignac number, because 1216627101 - 2¹ = 1216627099 is a prime.

It is a super-3 number, since 3×1216627101³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216627109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478096 + ... + 480633.

It is an arithmetic number, because the mean of its divisors is an integer number (115047600).

Almost surely, 2^1216627101 is an apocalyptic number.

It is an amenable number.

1216627101 is a deficient number, since it is larger than the sum of its proper divisors (624134499).

1216627101 is an equidigital number, since it uses as much as digits as its factorization.

1216627101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958785 (or 958779 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1216627101 is about 34880.1820666120. The cubic root of 1216627101 is about 1067.5441101215.

The spelling of 1216627101 in words is "one billion, two hundred sixteen million, six hundred twenty-seven thousand, one hundred one".