1224212291 has 2 divisors, whose sum is σ = 1224212292. Its totient is φ = 1224212290.

The previous prime is 1224212287. The next prime is 1224212369. The reversal of 1224212291 is 1922124221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1922124221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224212291 - 2² = 1224212287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1224212291.

It is not a weakly prime, because it can be changed into another prime (1224212221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612106145 + 612106146.

It is an arithmetic number, because the mean of its divisors is an integer number (612106146).

Almost surely, 2^1224212291 is an apocalyptic number.

1224212291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224212291 is an equidigital number, since it uses as much as digits as its factorization.

1224212291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 1224212291 is about 34988.7452047083. The cubic root of 1224212291 is about 1069.7580875068.

The spelling of 1224212291 in words is "one billion, two hundred twenty-four million, two hundred twelve thousand, two hundred ninety-one".