421052551 has 2 divisors, whose sum is σ = 421052552. Its totient is φ = 421052550.

The previous prime is 421052543. The next prime is 421052579. The reversal of 421052551 is 155250124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421052551 - 2³ = 421052543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421052531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210526275 + 210526276.

It is an arithmetic number, because the mean of its divisors is an integer number (210526276).

Almost surely, 2^421052551 is an apocalyptic number.

421052551 is a deficient number, since it is larger than the sum of its proper divisors (1).

421052551 is an equidigital number, since it uses as much as digits as its factorization.

421052551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 421052551 is about 20519.5650782369. The cubic root of 421052551 is about 749.5123057560.

The spelling of 421052551 in words is "four hundred twenty-one million, fifty-two thousand, five hundred fifty-one".