659346421 has 2 divisors, whose sum is σ = 659346422. Its totient is φ = 659346420.

The previous prime is 659346419. The next prime is 659346427. The reversal of 659346421 is 124643956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657358321 + 1988100 = 25639^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 659346421 - 2¹ = 659346419 is a prime.

Together with 659346419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659346427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329673210 + 329673211.

It is an arithmetic number, because the mean of its divisors is an integer number (329673211).

Almost surely, 2^659346421 is an apocalyptic number.

It is an amenable number.

659346421 is a deficient number, since it is larger than the sum of its proper divisors (1).

659346421 is an equidigital number, since it uses as much as digits as its factorization.

659346421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 659346421 is about 25677.7417426066. The cubic root of 659346421 is about 870.3712780936.

The spelling of 659346421 in words is "six hundred fifty-nine million, three hundred forty-six thousand, four hundred twenty-one".