421564529 has 2 divisors, whose sum is σ = 421564530. Its totient is φ = 421564528.

The previous prime is 421564439. The next prime is 421564537. The reversal of 421564529 is 925465124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307651600 + 113912929 = 17540^2 + 10673^2 .

It is a cyclic number.

It is not a de Polignac number, because 421564529 - 2¹⁶ = 421498993 is a prime.

It is a super-2 number, since 2×421564529² = 355433304221983682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 421564492 and 421564501.

It is not a weakly prime, because it can be changed into another prime (421564729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210782264 + 210782265.

It is an arithmetic number, because the mean of its divisors is an integer number (210782265).

Almost surely, 2^421564529 is an apocalyptic number.

It is an amenable number.

421564529 is a deficient number, since it is larger than the sum of its proper divisors (1).

421564529 is an equidigital number, since it uses as much as digits as its factorization.

421564529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 421564529 is about 20532.0366500744. The cubic root of 421564529 is about 749.8159720338.

The spelling of 421564529 in words is "four hundred twenty-one million, five hundred sixty-four thousand, five hundred twenty-nine".