475139551921 has 4 divisors (see below), whose sum is σ = 476048041072. Its totient is φ = 474231062772.

The previous prime is 475139551877. The next prime is 475139551927. The reversal of 475139551921 is 129155931574.

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 475139551921 - 2¹¹ = 475139549873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (475139551927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454243791 + ... + 454244836.

It is an arithmetic number, because the mean of its divisors is an integer number (119012010268).

Almost surely, 2^475139551921 is an apocalyptic number.

It is an amenable number.

475139551921 is a deficient number, since it is larger than the sum of its proper divisors (908489151).

475139551921 is an equidigital number, since it uses as much as digits as its factorization.

475139551921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908489150.

The product of its digits is 1701000, while the sum is 52.

The spelling of 475139551921 in words is "four hundred seventy-five billion, one hundred thirty-nine million, five hundred fifty-one thousand, nine hundred twenty-one".