205212531 has 4 divisors (see below), whose sum is σ = 273616712. Its totient is φ = 136808352.

The previous prime is 205212517. The next prime is 205212541. The reversal of 205212531 is 135212502.

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

It is not a de Polignac number, because 205212531 - 2¹³ = 205204339 is a prime.

It is a super-2 number, since 2×205212531² = 84224365758851922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205212498 and 205212507.

It is not an unprimeable number, because it can be changed into a prime (205212541) 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, 34202086 + ... + 34202091.

It is an arithmetic number, because the mean of its divisors is an integer number (68404178).

Almost surely, 2^205212531 is an apocalyptic number.

205212531 is a deficient number, since it is larger than the sum of its proper divisors (68404181).

205212531 is an equidigital number, since it uses as much as digits as its factorization.

205212531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68404180.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 205212531 is about 14325.2410450924. The cubic root of 205212531 is about 589.8405496532.

The spelling of 205212531 in words is "two hundred five million, two hundred twelve thousand, five hundred thirty-one".