159725121 has 4 divisors (see below), whose sum is σ = 212966832. Its totient is φ = 106483412.

The previous prime is 159725107. The next prime is 159725173. The reversal of 159725121 is 121527951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159725121 - 2⁶ = 159725057 is a prime.

It is a super-2 number, since 2×159725121² = 51024228556929282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (159725821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26620851 + ... + 26620856.

It is an arithmetic number, because the mean of its divisors is an integer number (53241708).

Almost surely, 2^159725121 is an apocalyptic number.

It is an amenable number.

159725121 is a deficient number, since it is larger than the sum of its proper divisors (53241711).

159725121 is an equidigital number, since it uses as much as digits as its factorization.

159725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53241710.

The product of its digits is 6300, while the sum is 33.

The square root of 159725121 is about 12638.2404234134. The cubic root of 159725121 is about 542.5724549464.

The spelling of 159725121 in words is "one hundred fifty-nine million, seven hundred twenty-five thousand, one hundred twenty-one".