425555551 has 2 divisors, whose sum is σ = 425555552. Its totient is φ = 425555550.

The previous prime is 425555549. The next prime is 425555567. The reversal of 425555551 is 155555524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 425555551 - 2¹ = 425555549 is a prime.

Together with 425555549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 425555551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425550551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212777775 + 212777776.

It is an arithmetic number, because the mean of its divisors is an integer number (212777776).

Almost surely, 2^425555551 is an apocalyptic number.

425555551 is a deficient number, since it is larger than the sum of its proper divisors (1).

425555551 is an equidigital number, since it uses as much as digits as its factorization.

425555551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125000, while the sum is 37.

The square root of 425555551 is about 20628.9978186048. The cubic root of 425555551 is about 752.1747550845.

The spelling of 425555551 in words is "four hundred twenty-five million, five hundred fifty-five thousand, five hundred fifty-one".