205213531 has 4 divisors (see below), whose sum is σ = 205248952. Its totient is φ = 205178112.

The previous prime is 205213529. The next prime is 205213553. The reversal of 205213531 is 135312502.

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

It is a cyclic number.

It is not a de Polignac number, because 205213531 - 2¹ = 205213529 is a prime.

It is a super-2 number, since 2×205213531² = 84225186610975922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205213571) 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, 6765 + ... + 21358.

It is an arithmetic number, because the mean of its divisors is an integer number (51312238).

Almost surely, 2^205213531 is an apocalyptic number.

205213531 is a deficient number, since it is larger than the sum of its proper divisors (35421).

205213531 is an equidigital number, since it uses as much as digits as its factorization.

205213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35420.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 205213531 is about 14325.2759484765. The cubic root of 205213531 is about 589.8415077487.

The spelling of 205213531 in words is "two hundred five million, two hundred thirteen thousand, five hundred thirty-one".