429981689 has 2 divisors, whose sum is σ = 429981690. Its totient is φ = 429981688.

The previous prime is 429981677. The next prime is 429981691. The reversal of 429981689 is 986189924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311346025 + 118635664 = 17645^2 + 10892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-429981689 is a prime.

Together with 429981691, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (429981659) 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, 214990844 + 214990845.

It is an arithmetic number, because the mean of its divisors is an integer number (214990845).

Almost surely, 2^429981689 is an apocalyptic number.

It is an amenable number.

429981689 is a deficient number, since it is larger than the sum of its proper divisors (1).

429981689 is an equidigital number, since it uses as much as digits as its factorization.

429981689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 56.

The square root of 429981689 is about 20735.9998312114. Note that the first 3 decimals coincide. The cubic root of 429981689 is about 754.7735174363.

The spelling of 429981689 in words is "four hundred twenty-nine million, nine hundred eighty-one thousand, six hundred eighty-nine".