421605791 has 2 divisors, whose sum is σ = 421605792. Its totient is φ = 421605790.

The previous prime is 421605757. The next prime is 421605817. The reversal of 421605791 is 197506124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421605791 - 2¹⁴ = 421589407 is a prime.

It is a Chen prime.

It is equal to p_22425398 and since 421605791 and 22425398 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421625791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210802895 + 210802896.

It is an arithmetic number, because the mean of its divisors is an integer number (210802896).

Almost surely, 2^421605791 is an apocalyptic number.

421605791 is a deficient number, since it is larger than the sum of its proper divisors (1).

421605791 is an equidigital number, since it uses as much as digits as its factorization.

421605791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 421605791 is about 20533.0414454362. The cubic root of 421605791 is about 749.8404347951.

The spelling of 421605791 in words is "four hundred twenty-one million, six hundred five thousand, seven hundred ninety-one".