531000205 has 4 divisors (see below), whose sum is σ = 637200252. Its totient is φ = 424800160.

The previous prime is 531000203. The next prime is 531000227. The reversal of 531000205 is 502000135.

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 356680996 + 174319209 = 18886^2 + 13203^2 .

It is not a de Polignac number, because 531000205 - 2¹ = 531000203 is a prime.

It is a super-2 number, since 2×531000205² = 563922435420084050, 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 (531000203) 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, 53100016 + ... + 53100025.

It is an arithmetic number, because the mean of its divisors is an integer number (159300063).

Almost surely, 2^531000205 is an apocalyptic number.

It is an amenable number.

531000205 is a deficient number, since it is larger than the sum of its proper divisors (106200047).

531000205 is a wasteful number, since it uses less digits than its factorization.

531000205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106200046.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 531000205 is about 23043.4416917265. The cubic root of 531000205 is about 809.7759909941.

The spelling of 531000205 in words is "five hundred thirty-one million, two hundred five", and thus it is an aban number.