2521901 has 2 divisors, whose sum is σ = 2521902. Its totient is φ = 2521900.

The previous prime is 2521847. The next prime is 2521919. The reversal of 2521901 is 1091252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2399401 + 122500 = 1549^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521901 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260950 + 1260951.

It is an arithmetic number, because the mean of its divisors is an integer number (1260951).

2^2521901 is an apocalyptic number.

It is an amenable number.

2521901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521901 is an equidigital number, since it uses as much as digits as its factorization.

2521901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 2521901 is about 1588.0494324800. The cubic root of 2521901 is about 136.1160521815.

The spelling of 2521901 in words is "two million, five hundred twenty-one thousand, nine hundred one".