421600513 has 2 divisors, whose sum is σ = 421600514. Its totient is φ = 421600512.

The previous prime is 421600471. The next prime is 421600523. The reversal of 421600513 is 315006124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417303184 + 4297329 = 20428^2 + 2073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421600513 is a prime.

It is equal to p_22425142 and since 421600513 and 22425142 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421600523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210800256 + 210800257.

It is an arithmetic number, because the mean of its divisors is an integer number (210800257).

Almost surely, 2^421600513 is an apocalyptic number.

It is an amenable number.

421600513 is a deficient number, since it is larger than the sum of its proper divisors (1).

421600513 is an equidigital number, since it uses as much as digits as its factorization.

421600513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 421600513 is about 20532.9129204796. The cubic root of 421600513 is about 749.8373057470.

Adding to 421600513 its reverse (315006124), we get a palindrome (736606637).

The spelling of 421600513 in words is "four hundred twenty-one million, six hundred thousand, five hundred thirteen".