521251 has 2 divisors, whose sum is σ = 521252. Its totient is φ = 521250.

The previous prime is 521243. The next prime is 521267. The reversal of 521251 is 152125.

It is an a-pointer prime, because the next prime (521267) can be obtained adding 521251 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521251 - 2³ = 521243 is a prime.

521251 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (521201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260625 + 260626.

It is an arithmetic number, because the mean of its divisors is an integer number (260626).

2⁵²¹²⁵¹ is an apocalyptic number.

521251 is a deficient number, since it is larger than the sum of its proper divisors (1).

521251 is an equidigital number, since it uses as much as digits as its factorization.

521251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100, while the sum is 16.

The square root of 521251 is about 721.9771464527. The cubic root of 521251 is about 80.4789497832.

Adding to 521251 its reverse (152125), we get a palindrome (673376).

The spelling of 521251 in words is "five hundred twenty-one thousand, two hundred fifty-one".