159621 has 16 divisors (see below), whose sum is σ = 265728. Its totient is φ = 82800.
The previous prime is 159617. The next prime is 159623. The reversal of 159621 is 126951.
It is not a de Polignac number, because 159621 - 22 = 159617 is a prime.
159621 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 159591 and 159600.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (159623) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115 + ... + 576.
It is an arithmetic number, because the mean of its divisors is an integer number (16608).
2159621 is an apocalyptic number.
159621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
159621 is the 231-st octagonal number.
It is an amenable number.
159621 is a deficient number, since it is larger than the sum of its proper divisors (106107).
159621 is a wasteful number, since it uses less digits than its factorization.
159621 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 712.
The product of its digits is 540, while the sum is 24.
The square root of 159621 is about 399.5259691184. The cubic root of 159621 is about 54.2454532635.
It can be divided in two parts, 159 and 621, that added together give a triangular number (780 = T39).
The spelling of 159621 in words is "one hundred fifty-nine thousand, six hundred twenty-one".
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