12219551 has 2 divisors, whose sum is σ = 12219552. Its totient is φ = 12219550.

The previous prime is 12219547. The next prime is 12219587. The reversal of 12219551 is 15591221.

It is a weak prime.

It is an emirp because it is prime and its reverse (15591221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12219551 - 2² = 12219547 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12219551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12219511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109775 + 6109776.

It is an arithmetic number, because the mean of its divisors is an integer number (6109776).

Almost surely, 2^12219551 is an apocalyptic number.

12219551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219551 is an equidigital number, since it uses as much as digits as its factorization.

12219551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 26.

The square root of 12219551 is about 3495.6474364558. The cubic root of 12219551 is about 230.3306586176.

The spelling of 12219551 in words is "twelve million, two hundred nineteen thousand, five hundred fifty-one".