205030531 has 4 divisors (see below), whose sum is σ = 205076632. Its totient is φ = 204984432.

The previous prime is 205030513. The next prime is 205030537. The reversal of 205030531 is 135030502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135030502 = 2 ⋅67515251.

It is a cyclic number.

It is not a de Polignac number, because 205030531 - 2⁵ = 205030499 is a prime.

It is a super-2 number, since 2×205030531² = 84075037284283922, 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 = 205030499 and 205030508.

It is not an unprimeable number, because it can be changed into a prime (205030537) 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, 15570 + ... + 25543.

It is an arithmetic number, because the mean of its divisors is an integer number (51269158).

Almost surely, 2^205030531 is an apocalyptic number.

205030531 is a deficient number, since it is larger than the sum of its proper divisors (46101).

205030531 is an equidigital number, since it uses as much as digits as its factorization.

205030531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46100.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 205030531 is about 14318.8872123500. The cubic root of 205030531 is about 589.6661244184. Note that the first 3 decimals are identical.

The spelling of 205030531 in words is "two hundred five million, thirty thousand, five hundred thirty-one".