425551421 has 2 divisors, whose sum is σ = 425551422. Its totient is φ = 425551420.

The previous prime is 425551409. The next prime is 425551447. The reversal of 425551421 is 124155524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315595225 + 109956196 = 17765^2 + 10486^2 .

It is a cyclic number.

It is not a de Polignac number, because 425551421 - 2¹⁰ = 425550397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425551121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212775710 + 212775711.

It is an arithmetic number, because the mean of its divisors is an integer number (212775711).

Almost surely, 2^425551421 is an apocalyptic number.

It is an amenable number.

425551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

425551421 is an equidigital number, since it uses as much as digits as its factorization.

425551421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8000, while the sum is 29.

The square root of 425551421 is about 20628.8977165529. The cubic root of 425551421 is about 752.1723218011.

The spelling of 425551421 in words is "four hundred twenty-five million, five hundred fifty-one thousand, four hundred twenty-one".