421525397 has 2 divisors, whose sum is σ = 421525398. Its totient is φ = 421525396.

The previous prime is 421525373. The next prime is 421525427. The reversal of 421525397 is 793525124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277189201 + 144336196 = 16649^2 + 12014^2 .

It is a cyclic number.

It is not a de Polignac number, because 421525397 - 2¹⁴ = 421509013 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421525397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421525297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210762698 + 210762699.

It is an arithmetic number, because the mean of its divisors is an integer number (210762699).

Almost surely, 2^421525397 is an apocalyptic number.

It is an amenable number.

421525397 is a deficient number, since it is larger than the sum of its proper divisors (1).

421525397 is an equidigital number, since it uses as much as digits as its factorization.

421525397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 38.

The square root of 421525397 is about 20531.0836781695. The cubic root of 421525397 is about 749.7927705984.

The spelling of 421525397 in words is "four hundred twenty-one million, five hundred twenty-five thousand, three hundred ninety-seven".