423405551 has 4 divisors (see below), whose sum is σ = 441814512. Its totient is φ = 404996592.

The previous prime is 423405547. The next prime is 423405559. The reversal of 423405551 is 155504324.

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 423405551 - 2² = 423405547 is a prime.

It is a super-2 number, since 2×423405551² = 358544521235227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423405559) 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 in 3 ways as a sum of consecutive naturals, for example, 9204446 + ... + 9204491.

It is an arithmetic number, because the mean of its divisors is an integer number (110453628).

Almost surely, 2^423405551 is an apocalyptic number.

423405551 is a deficient number, since it is larger than the sum of its proper divisors (18408961).

423405551 is a wasteful number, since it uses less digits than its factorization.

423405551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408960.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 423405551 is about 20576.8207213845. The cubic root of 423405551 is about 750.9058985417.

Adding to 423405551 its reverse (155504324), we get a palindrome (578909875).

The spelling of 423405551 in words is "four hundred twenty-three million, four hundred five thousand, five hundred fifty-one".