1245221447 has 2 divisors, whose sum is σ = 1245221448. Its totient is φ = 1245221446.

The previous prime is 1245221441. The next prime is 1245221489. The reversal of 1245221447 is 7441225421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1245221447 - 2²² = 1241027143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245221441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622610723 + 622610724.

It is an arithmetic number, because the mean of its divisors is an integer number (622610724).

Almost surely, 2^1245221447 is an apocalyptic number.

1245221447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245221447 is an equidigital number, since it uses as much as digits as its factorization.

1245221447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 32.

The square root of 1245221447 is about 35287.6954050559. The cubic root of 1245221447 is about 1075.8429147349.

Adding to 1245221447 its reverse (7441225421), we get a palindrome (8686446868).

The spelling of 1245221447 in words is "one billion, two hundred forty-five million, two hundred twenty-one thousand, four hundred forty-seven".