1216545 has 32 divisors (see below), whose sum is σ = 2173824. Its totient is φ = 576000.

The previous prime is 1216543. The next prime is 1216547. The reversal of 1216545 is 5456121.

It is an interprime number because it is at equal distance from previous prime (1216543) and next prime (1216547).

It is not a de Polignac number, because 1216545 - 2¹ = 1216543 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11995 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (67932).

2^1216545 is an apocalyptic number.

1216545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216545 is a deficient number, since it is larger than the sum of its proper divisors (957279).

1216545 is a wasteful number, since it uses less digits than its factorization.

1216545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193.

The product of its digits is 1200, while the sum is 24.

The square root of 1216545 is about 1102.9709878324. The cubic root of 1216545 is about 106.7520096077.

It can be divided in two parts, 121 and 6545, that added together give a palindrome (6666).

The spelling of 1216545 in words is "one million, two hundred sixteen thousand, five hundred forty-five".