159631 has 2 divisors, whose sum is σ = 159632. Its totient is φ = 159630.

The previous prime is 159629. The next prime is 159667. The reversal of 159631 is 136951.

It is a weak prime.

It is an emirp because it is prime and its reverse (136951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159631 - 2¹ = 159629 is a prime.

It is a super-2 number, since 2×159631² = 50964112322, which contains 22 as substring.

Together with 159629, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 159596 and 159605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79815 + 79816.

It is an arithmetic number, because the mean of its divisors is an integer number (79816).

2¹⁵⁹⁶³¹ is an apocalyptic number.

159631 is a deficient number, since it is larger than the sum of its proper divisors (1).

159631 is an equidigital number, since it uses as much as digits as its factorization.

159631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 159631 is about 399.5384837534. The cubic root of 159631 is about 54.2465860367.

The spelling of 159631 in words is "one hundred fifty-nine thousand, six hundred thirty-one".