842661329 has 2 divisors, whose sum is σ = 842661330. Its totient is φ = 842661328.

The previous prime is 842661319. The next prime is 842661359. The reversal of 842661329 is 923166248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826275025 + 16386304 = 28745^2 + 4048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842661329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (842661319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421330664 + 421330665.

It is an arithmetic number, because the mean of its divisors is an integer number (421330665).

Almost surely, 2^842661329 is an apocalyptic number.

It is an amenable number.

842661329 is a deficient number, since it is larger than the sum of its proper divisors (1).

842661329 is an equidigital number, since it uses as much as digits as its factorization.

842661329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 842661329 is about 29028.6294716096. The cubic root of 842661329 is about 944.5342007948.

The spelling of 842661329 in words is "eight hundred forty-two million, six hundred sixty-one thousand, three hundred twenty-nine".