159400121 has 2 divisors, whose sum is σ = 159400122. Its totient is φ = 159400120.

The previous prime is 159400103. The next prime is 159400201. The reversal of 159400121 is 121004951.

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., 89510521 + 69889600 = 9461^2 + 8360^2 .

It is an emirp because it is prime and its reverse (121004951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159400121 is a prime.

It is not a weakly prime, because it can be changed into another prime (159408121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79700060 + 79700061.

It is an arithmetic number, because the mean of its divisors is an integer number (79700061).

Almost surely, 2^159400121 is an apocalyptic number.

It is an amenable number.

159400121 is a deficient number, since it is larger than the sum of its proper divisors (1).

159400121 is an equidigital number, since it uses as much as digits as its factorization.

159400121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 159400121 is about 12625.3760736067. The cubic root of 159400121 is about 542.2042060828.

The spelling of 159400121 in words is "one hundred fifty-nine million, four hundred thousand, one hundred twenty-one".