6478479121 has 3 divisors (see below), whose sum is σ = 6478559611. Its totient is φ = 6478398632.

The previous prime is 6478479113. The next prime is 6478479181. The reversal of 6478479121 is 1219748746.

The square root of 6478479121 is 80489.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 6350336721 + 128142400 = 79689^2 + 11320^2 .

It is not a de Polignac number, because 6478479121 - 2³ = 6478479113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6478479181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40245 + ... + 120733.

Almost surely, 2^6478479121 is an apocalyptic number.

6478479121 is the 80489-th square number.

6478479121 is the 40245-th centered octagonal number.

It is an amenable number.

6478479121 is a deficient number, since it is larger than the sum of its proper divisors (80490).

6478479121 is an frugal number, since it uses more digits than its factorization.

6478479121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160978 (or 80489 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

The cubic root of 6478479121 is about 1864.1936364603.

Multiplying 6478479121 by its sum of digits (49), we get a square (317445476929 = 563423²).

The spelling of 6478479121 in words is "six billion, four hundred seventy-eight million, four hundred seventy-nine thousand, one hundred twenty-one".