159725123 has 4 divisors (see below), whose sum is σ = 161747040. Its totient is φ = 157703208.

The previous prime is 159725107. The next prime is 159725173. The reversal of 159725123 is 321527951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 159725123 - 2⁴ = 159725107 is a prime.

It is a super-2 number, since 2×159725123² = 51024229834730258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159725173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010840 + ... + 1010997.

It is an arithmetic number, because the mean of its divisors is an integer number (40436760).

Almost surely, 2^159725123 is an apocalyptic number.

159725123 is a deficient number, since it is larger than the sum of its proper divisors (2021917).

159725123 is an equidigital number, since it uses as much as digits as its factorization.

159725123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021916.

The product of its digits is 18900, while the sum is 35.

The square root of 159725123 is about 12638.2405025383. The cubic root of 159725123 is about 542.5724572110.

The spelling of 159725123 in words is "one hundred fifty-nine million, seven hundred twenty-five thousand, one hundred twenty-three".