204211631 has 4 divisors (see below), whose sum is σ = 219920232. Its totient is φ = 188503032.

The previous prime is 204211589. The next prime is 204211673. The reversal of 204211631 is 136112402.

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

It is an interprime number because it is at equal distance from previous prime (204211589) and next prime (204211673).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204211631 is a prime.

It is a super-2 number, since 2×204211631² = 83404780471360322, 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 (204211831) 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 3 ways as a sum of consecutive naturals, for example, 7854281 + ... + 7854306.

It is an arithmetic number, because the mean of its divisors is an integer number (54980058).

Almost surely, 2^204211631 is an apocalyptic number.

204211631 is a deficient number, since it is larger than the sum of its proper divisors (15708601).

204211631 is a wasteful number, since it uses less digits than its factorization.

204211631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15708600.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 204211631 is about 14290.2635035188. The cubic root of 204211631 is about 588.8800270267.

The spelling of 204211631 in words is "two hundred four million, two hundred eleven thousand, six hundred thirty-one".