156001 has 4 divisors (see below), whose sum is σ = 158212. Its totient is φ = 153792.

The previous prime is 155921. The next prime is 156007. The reversal of 156001 is 100651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100651 = 251 ⋅401.

It can be written as a sum of positive squares in 2 ways, for example, as 40401 + 115600 = 201^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 156001 - 2¹¹ = 153953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (39553).

2¹⁵⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

156001 is a deficient number, since it is larger than the sum of its proper divisors (2211).

156001 is an equidigital number, since it uses as much as digits as its factorization.

156001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 156001 is about 394.9696190848. The cubic root of 156001 is about 53.8322411465.

Adding to 156001 its reverse (100651), we get a palindrome (256652).

The spelling of 156001 in words is "one hundred fifty-six thousand, one".