2016401 has 2 divisors, whose sum is σ = 2016402. Its totient is φ = 2016400.

The previous prime is 2016397. The next prime is 2016403. The reversal of 2016401 is 1046102.

It is a Cunningham number, because it is equal to 1420²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2016400 + 1 = 1420^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 2016401 - 2² = 2016397 is a prime.

Together with 2016403, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (2016403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008200 + 1008201.

It is an arithmetic number, because the mean of its divisors is an integer number (1008201).

2^2016401 is an apocalyptic number.

It is an amenable number.

2016401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2016401 is an equidigital number, since it uses as much as digits as its factorization.

2016401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2016401 is about 1420.0003521126. Note that the first 3 decimals coincide. The cubic root of 2016401 is about 126.3355672583.

Subtracting from 2016401 its reverse (1046102), we obtain a cube (970299 = 99³).

The spelling of 2016401 in words is "two million, sixteen thousand, four hundred one".