2156001 has 8 divisors (see below), whose sum is σ = 2892960. Its totient is φ = 1428192.

The previous prime is 2155999. The next prime is 2156009. The reversal of 2156001 is 1006512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156001 - 2¹ = 2155999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2156009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1716 + ... + 2693.

It is an arithmetic number, because the mean of its divisors is an integer number (361620).

2^2156001 is an apocalyptic number.

It is an amenable number.

2156001 is a deficient number, since it is larger than the sum of its proper divisors (736959).

2156001 is a wasteful number, since it uses less digits than its factorization.

2156001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4575.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2156001 is about 1468.3327279605. The cubic root of 2156001 is about 129.1862581914.

It can be divided in two parts, 215 and 6001, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 2156001 in words is "two million, one hundred fifty-six thousand, one".