478121537 has 4 divisors (see below), whose sum is σ = 478165380. Its totient is φ = 478077696.

The previous prime is 478121531. The next prime is 478121563. The reversal of 478121537 is 735121874.

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 2 ways, for example, as 426050881 + 52070656 = 20641^2 + 7216^2 .

It is a cyclic number.

It is not a de Polignac number, because 478121537 - 2¹⁴ = 478105153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 478121537.

It is not an unprimeable number, because it can be changed into a prime (478121531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8633 + ... + 32105.

It is an arithmetic number, because the mean of its divisors is an integer number (119541345).

Almost surely, 2^478121537 is an apocalyptic number.

It is an amenable number.

478121537 is a deficient number, since it is larger than the sum of its proper divisors (43843).

478121537 is a wasteful number, since it uses less digits than its factorization.

478121537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43842.

The product of its digits is 47040, while the sum is 38.

The square root of 478121537 is about 21865.9904189131. The cubic root of 478121537 is about 781.9508132275.

The spelling of 478121537 in words is "four hundred seventy-eight million, one hundred twenty-one thousand, five hundred thirty-seven".