208493631 has 48 divisors (see below), whose sum is σ = 336394240. Its totient is φ = 123871680.

The previous prime is 208493629. The next prime is 208493641. The reversal of 208493631 is 136394802.

It is not a de Polignac number, because 208493631 - 2¹ = 208493629 is a prime.

It is a super-2 number, since 2×208493631² = 86939188335128322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208493611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195606 + ... + 196668.

Almost surely, 2^208493631 is an apocalyptic number.

208493631 is a deficient number, since it is larger than the sum of its proper divisors (127900609).

208493631 is a wasteful number, since it uses less digits than its factorization.

208493631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 208493631 is about 14439.3085360761. The cubic root of 208493631 is about 592.9675548888.

The spelling of 208493631 in words is "two hundred eight million, four hundred ninety-three thousand, six hundred thirty-one".