2131601 has 2 divisors, whose sum is σ = 2131602. Its totient is φ = 2131600.

The previous prime is 2131573. The next prime is 2131603. The reversal of 2131601 is 1061312.

It is a Cunningham number, because it is equal to 1460²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 1 = 1460^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131601 - 2⁶ = 2131537 is a prime.

Together with 2131603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2131603) 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 as a sum of consecutive naturals, namely, 1065800 + 1065801.

It is an arithmetic number, because the mean of its divisors is an integer number (1065801).

2^2131601 is an apocalyptic number.

It is an amenable number.

2131601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131601 is an equidigital number, since it uses as much as digits as its factorization.

2131601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2131601 is about 1460.0003424657. Note that the first 3 decimals coincide. The cubic root of 2131601 is about 128.6970637314.

Adding to 2131601 its reverse (1061312), we get a palindrome (3192913).

The spelling of 2131601 in words is "two million, one hundred thirty-one thousand, six hundred one".