478135631 has 4 divisors (see below), whose sum is σ = 487157112. Its totient is φ = 469114152.

The previous prime is 478135607. The next prime is 478135639. The reversal of 478135631 is 136531874.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478135631 is a prime.

It is a super-3 number, since 3×478135631³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478135639) 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, 4510661 + ... + 4510766.

It is an arithmetic number, because the mean of its divisors is an integer number (121789278).

Almost surely, 2^478135631 is an apocalyptic number.

478135631 is a deficient number, since it is larger than the sum of its proper divisors (9021481).

478135631 is an equidigital number, since it uses as much as digits as its factorization.

478135631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9021480.

The product of its digits is 60480, while the sum is 38.

The square root of 478135631 is about 21866.3126978464. The cubic root of 478135631 is about 781.9584965643.

The spelling of 478135631 in words is "four hundred seventy-eight million, one hundred thirty-five thousand, six hundred thirty-one".