525420251 has 2 divisors, whose sum is σ = 525420252. Its totient is φ = 525420250.

The previous prime is 525420227. The next prime is 525420253. The reversal of 525420251 is 152024525.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 525420251 - 2⁶ = 525420187 is a prime.

Together with 525420253, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_27622601 and since 525420251 and 27622601 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 525420251.

It is not a weakly prime, because it can be changed into another prime (525420253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262710125 + 262710126.

It is an arithmetic number, because the mean of its divisors is an integer number (262710126).

Almost surely, 2^525420251 is an apocalyptic number.

525420251 is a deficient number, since it is larger than the sum of its proper divisors (1).

525420251 is an equidigital number, since it uses as much as digits as its factorization.

525420251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 525420251 is about 22922.0472689505. The cubic root of 525420251 is about 806.9295179844.

Adding to 525420251 its reverse (152024525), we get a palindrome (677444776).

The spelling of 525420251 in words is "five hundred twenty-five million, four hundred twenty thousand, two hundred fifty-one".