1221451229 has 2 divisors, whose sum is σ = 1221451230. Its totient is φ = 1221451228.

The previous prime is 1221451177. The next prime is 1221451237. The reversal of 1221451229 is 9221541221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211179204 + 10272025 = 34802^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221451229 - 2⁸ = 1221450973 is a prime.

It is a super-2 number, since 2×1221451229² = 2983886209651220882, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221451279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610725614 + 610725615.

It is an arithmetic number, because the mean of its divisors is an integer number (610725615).

Almost surely, 2^1221451229 is an apocalyptic number.

It is an amenable number.

1221451229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221451229 is an equidigital number, since it uses as much as digits as its factorization.

1221451229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 1221451229 is about 34949.2665016020. The cubic root of 1221451229 is about 1068.9532456888.

The spelling of 1221451229 in words is "one billion, two hundred twenty-one million, four hundred fifty-one thousand, two hundred twenty-nine".