428138551 has 4 divisors (see below), whose sum is σ = 441949504. Its totient is φ = 414327600.

The previous prime is 428138549. The next prime is 428138561. The reversal of 428138551 is 155831824.

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 428138551 - 2¹ = 428138549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428138551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428138561) 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, 6905430 + ... + 6905491.

It is an arithmetic number, because the mean of its divisors is an integer number (110487376).

Almost surely, 2^428138551 is an apocalyptic number.

428138551 is a deficient number, since it is larger than the sum of its proper divisors (13810953).

428138551 is a wasteful number, since it uses less digits than its factorization.

428138551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13810952.

The product of its digits is 38400, while the sum is 37.

The square root of 428138551 is about 20691.5091523069. The cubic root of 428138551 is about 753.6935146661.

The spelling of 428138551 in words is "four hundred twenty-eight million, one hundred thirty-eight thousand, five hundred fifty-one".