201931228 has 18 divisors (see below), whose sum is σ = 359294208. Its totient is φ = 99303120.

The previous prime is 201931211. The next prime is 201931291. The reversal of 201931228 is 822139102.

It is a junction number, because it is equal to n+sod(n) for n = 201931196 and 201931205.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 8101 + ... + 21667.

Almost surely, 2^201931228 is an apocalyptic number.

It is an amenable number.

201931228 is a deficient number, since it is larger than the sum of its proper divisors (157362980).

201931228 is a wasteful number, since it uses less digits than its factorization.

201931228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13693 (or 13630 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 201931228 is about 14210.2508070759. The cubic root of 201931228 is about 586.6798362804.

The spelling of 201931228 in words is "two hundred one million, nine hundred thirty-one thousand, two hundred twenty-eight".