205012631 has 4 divisors (see below), whose sum is σ = 205430664. Its totient is φ = 204594600.

The previous prime is 205012609. The next prime is 205012651. The reversal of 205012631 is 136210502.

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 205012631 - 2⁶ = 205012567 is a prime.

It is a super-2 number, since 2×205012631² = 84060357739084322, 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 (205012601) 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, 208280 + ... + 209261.

It is an arithmetic number, because the mean of its divisors is an integer number (51357666).

Almost surely, 2^205012631 is an apocalyptic number.

205012631 is a deficient number, since it is larger than the sum of its proper divisors (418033).

205012631 is an equidigital number, since it uses as much as digits as its factorization.

205012631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418032.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 205012631 is about 14318.2621501354. The cubic root of 205012631 is about 589.6489638347.

It can be divided in two parts, 20501 and 2631, that added together give a palindrome (23132).

The spelling of 205012631 in words is "two hundred five million, twelve thousand, six hundred thirty-one".