478142981 has 6 divisors (see below), whose sum is σ = 495200082. Its totient is φ = 461654480.

The previous prime is 478142957. The next prime is 478143007. The reversal of 478142981 is 189241874.

It can be written as a sum of positive squares in 3 ways, for example, as 247558756 + 230584225 = 15734^2 + 15185^2 .

It is a de Polignac number, because none of the positive numbers 2^k-478142981 is a prime.

It is a super-2 number, since 2×478142981² = 457241420559132722, 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 (478142911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283430 + ... + 285111.

It is an arithmetic number, because the mean of its divisors is an integer number (82533347).

Almost surely, 2^478142981 is an apocalyptic number.

It is an amenable number.

478142981 is a deficient number, since it is larger than the sum of its proper divisors (17057101).

478142981 is an equidigital number, since it uses as much as digits as its factorization.

478142981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568599 (or 568570 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 478142981 is about 21866.4807639455. The cubic root of 478142981 is about 781.9625033531.

The spelling of 478142981 in words is "four hundred seventy-eight million, one hundred forty-two thousand, nine hundred eighty-one".