531904055405 has 4 divisors (see below), whose sum is σ = 638284866492. Its totient is φ = 425523244320.

The previous prime is 531904055401. The next prime is 531904055483. The reversal of 531904055405 is 504550409135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 374380001956 + 157524053449 = 611866^2 + 396893^2 .

It is not a de Polignac number, because 531904055405 - 2² = 531904055401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531904055401) 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, 53190405536 + ... + 53190405545.

It is an arithmetic number, because the mean of its divisors is an integer number (159571216623).

Almost surely, 2^531904055405 is an apocalyptic number.

It is an amenable number.

531904055405 is a deficient number, since it is larger than the sum of its proper divisors (106380811087).

531904055405 is a wasteful number, since it uses less digits than its factorization.

531904055405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106380811086.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 531904055405 in words is "five hundred thirty-one billion, nine hundred four million, fifty-five thousand, four hundred five".