1216123 has 2 divisors, whose sum is σ = 1216124. Its totient is φ = 1216122.

The previous prime is 1216109. The next prime is 1216147. The reversal of 1216123 is 3216121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3216121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216123 - 2⁵ = 1216091 is a prime.

It is a super-2 number, since 2×1216123² = 2957910302258, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

1216123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1216097 and 1216106.

It is not a weakly prime, because it can be changed into another prime (1216823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608061 + 608062.

It is an arithmetic number, because the mean of its divisors is an integer number (608062).

2^1216123 is an apocalyptic number.

1216123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216123 is an equidigital number, since it uses as much as digits as its factorization.

1216123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 1216123 is about 1102.7796697437. The cubic root of 1216123 is about 106.7396646587.

The spelling of 1216123 in words is "one million, two hundred sixteen thousand, one hundred twenty-three".