478138551 has 16 divisors (see below), whose sum is σ = 696707328. Its totient is φ = 289267200.

The previous prime is 478138547. The next prime is 478138561. The reversal of 478138551 is 155831874.

It is not a de Polignac number, because 478138551 - 2² = 478138547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478138501) 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 15 ways as a sum of consecutive naturals, for example, 6486 + ... + 31596.

It is an arithmetic number, because the mean of its divisors is an integer number (43544208).

Almost surely, 2^478138551 is an apocalyptic number.

478138551 is a deficient number, since it is larger than the sum of its proper divisors (218568777).

478138551 is a wasteful number, since it uses less digits than its factorization.

478138551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25702.

The product of its digits is 134400, while the sum is 42.

The square root of 478138551 is about 21866.3794671180. The cubic root of 478138551 is about 781.9600883819.

The spelling of 478138551 in words is "four hundred seventy-eight million, one hundred thirty-eight thousand, five hundred fifty-one".