159021409 has 2 divisors, whose sum is σ = 159021410. Its totient is φ = 159021408.

The previous prime is 159021407. The next prime is 159021433. The reversal of 159021409 is 904120951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106502400 + 52519009 = 10320^2 + 7247^2 .

It is a cyclic number.

It is not a de Polignac number, because 159021409 - 2¹ = 159021407 is a prime.

Together with 159021407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159021407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79510704 + 79510705.

It is an arithmetic number, because the mean of its divisors is an integer number (79510705).

Almost surely, 2^159021409 is an apocalyptic number.

It is an amenable number.

159021409 is a deficient number, since it is larger than the sum of its proper divisors (1).

159021409 is an equidigital number, since it uses as much as digits as its factorization.

159021409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 159021409 is about 12610.3691064140. The cubic root of 159021409 is about 541.7744655616.

The spelling of 159021409 in words is "one hundred fifty-nine million, twenty-one thousand, four hundred nine".