423551 has 4 divisors (see below), whose sum is σ = 428400. Its totient is φ = 418704.

The previous prime is 423547. The next prime is 423557. The reversal of 423551 is 155324.

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 423551 - 2² = 423547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2291 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (107100).

2⁴²³⁵⁵¹ is an apocalyptic number.

423551 is a deficient number, since it is larger than the sum of its proper divisors (4849).

423551 is an equidigital number, since it uses as much as digits as its factorization.

423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848.

The product of its digits is 600, while the sum is 20.

The square root of 423551 is about 650.8079593859. The cubic root of 423551 is about 75.0991872858.

Adding to 423551 its reverse (155324), we get a palindrome (578875).

The spelling of 423551 in words is "four hundred twenty-three thousand, five hundred fifty-one".