159340921 has 2 divisors, whose sum is σ = 159340922. Its totient is φ = 159340920.

The previous prime is 159340919. The next prime is 159340939. The reversal of 159340921 is 129043951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153884025 + 5456896 = 12405^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 159340921 - 2¹ = 159340919 is a prime.

Together with 159340919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159340901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79670460 + 79670461.

It is an arithmetic number, because the mean of its divisors is an integer number (79670461).

Almost surely, 2^159340921 is an apocalyptic number.

It is an amenable number.

159340921 is a deficient number, since it is larger than the sum of its proper divisors (1).

159340921 is an equidigital number, since it uses as much as digits as its factorization.

159340921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 159340921 is about 12623.0313712674. The cubic root of 159340921 is about 542.1370742568.

The spelling of 159340921 in words is "one hundred fifty-nine million, three hundred forty thousand, nine hundred twenty-one".