1521901 has 2 divisors, whose sum is σ = 1521902. Its totient is φ = 1521900.

The previous prime is 1521893. The next prime is 1521913. The reversal of 1521901 is 1091251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1052676 + 469225 = 1026^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521901 - 2³ = 1521893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521991) 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, 760950 + 760951.

It is an arithmetic number, because the mean of its divisors is an integer number (760951).

2^1521901 is an apocalyptic number.

It is an amenable number.

1521901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521901 is an equidigital number, since it uses as much as digits as its factorization.

1521901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1521901 is about 1233.6535169974. The cubic root of 1521901 is about 115.0258543004.

The spelling of 1521901 in words is "one million, five hundred twenty-one thousand, nine hundred one".