205607631 has 12 divisors (see below), whose sum is σ = 281759816. Its totient is φ = 133269120.

The previous prime is 205607587. The next prime is 205607641. The reversal of 205607631 is 136706502.

It is not a de Polignac number, because 205607631 - 2⁹ = 205607119 is a prime.

It is a super-2 number, since 2×205607631² = 84548995850864322, 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 (205607641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150391 + ... + 151751.

Almost surely, 2^205607631 is an apocalyptic number.

205607631 is a deficient number, since it is larger than the sum of its proper divisors (76152185).

205607631 is an frugal number, since it uses more digits than its factorization.

205607631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 205607631 is about 14339.0247576326. The cubic root of 205607631 is about 590.2188511098.

The spelling of 205607631 in words is "two hundred five million, six hundred seven thousand, six hundred thirty-one".