220447429 has 2 divisors, whose sum is σ = 220447430. Its totient is φ = 220447428.

The previous prime is 220447427. The next prime is 220447439. The reversal of 220447429 is 924744022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148791204 + 71656225 = 12198^2 + 8465^2 .

It is a cyclic number.

It is not a de Polignac number, because 220447429 - 2¹ = 220447427 is a prime.

Together with 220447427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 220447394 and 220447403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220447421) 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, 110223714 + 110223715.

It is an arithmetic number, because the mean of its divisors is an integer number (110223715).

Almost surely, 2^220447429 is an apocalyptic number.

It is an amenable number.

220447429 is a deficient number, since it is larger than the sum of its proper divisors (1).

220447429 is an equidigital number, since it uses as much as digits as its factorization.

220447429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 220447429 is about 14847.4721417486. The cubic root of 220447429 is about 604.0900456734.

The spelling of 220447429 in words is "two hundred twenty million, four hundred forty-seven thousand, four hundred twenty-nine".