425551 has 4 divisors (see below), whose sum is σ = 486352. Its totient is φ = 364752.

The previous prime is 425549. The next prime is 425563. The reversal of 425551 is 155524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 425551 - 2¹ = 425549 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30390 + ... + 30403.

It is an arithmetic number, because the mean of its divisors is an integer number (121588).

2⁴²⁵⁵⁵¹ is an apocalyptic number.

425551 is a deficient number, since it is larger than the sum of its proper divisors (60801).

425551 is an equidigital number, since it uses as much as digits as its factorization.

425551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60800.

The product of its digits is 1000, while the sum is 22.

The square root of 425551 is about 652.3427013465. The cubic root of 425551 is about 75.2172073758.

The spelling of 425551 in words is "four hundred twenty-five thousand, five hundred fifty-one".