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521401 is a prime number
BaseRepresentation
bin1111111010010111001
3222111020011
41333102321
5113141101
615101521
74301056
oct1772271
9874204
10521401
11326811
122118a1
1315342a
14d802d
15a4751
hex7f4b9

521401 has 2 divisors, whose sum is σ = 521402. Its totient is φ = 521400.

The previous prime is 521399. The next prime is 521429. The reversal of 521401 is 104125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 251001 = 520^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 521401 - 21 = 521399 is a prime.

Together with 521399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (521471) 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, 260700 + 260701.

It is an arithmetic number, because the mean of its divisors is an integer number (260701).

2521401 is an apocalyptic number.

It is an amenable number.

521401 is a deficient number, since it is larger than the sum of its proper divisors (1).

521401 is an equidigital number, since it uses as much as digits as its factorization.

521401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 521401 is about 722.0810203848. The cubic root of 521401 is about 80.4866688313.

Adding to 521401 its reverse (104125), we get a palindrome (625526).

The spelling of 521401 in words is "five hundred twenty-one thousand, four hundred one".