478351981 has 4 divisors (see below), whose sum is σ = 480619264. Its totient is φ = 476084700.

The previous prime is 478351969. The next prime is 478351997. The reversal of 478351981 is 189153874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 478351981 - 2¹⁵ = 478319213 is a prime.

It is a super-2 number, since 2×478351981² = 457641235453248722, 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 (478351931) 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, 1133325 + ... + 1133746.

It is an arithmetic number, because the mean of its divisors is an integer number (120154816).

Almost surely, 2^478351981 is an apocalyptic number.

It is an amenable number.

478351981 is a deficient number, since it is larger than the sum of its proper divisors (2267283).

478351981 is a wasteful number, since it uses less digits than its factorization.

478351981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267282.

The product of its digits is 241920, while the sum is 46.

The square root of 478351981 is about 21871.2592458688. The cubic root of 478351981 is about 782.0764207121.

The spelling of 478351981 in words is "four hundred seventy-eight million, three hundred fifty-one thousand, nine hundred eighty-one".