31135228 has 12 divisors (see below), whose sum is σ = 57691872. Its totient is φ = 14651840.

The previous prime is 31135213. The next prime is 31135231. The reversal of 31135228 is 82253113.

It is a super-2 number, since 2×31135228² = 1938804845223968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228868 + ... + 229003.

It is an arithmetic number, because the mean of its divisors is an integer number (4807656).

Almost surely, 2^31135228 is an apocalyptic number.

It is an amenable number.

31135228 is a deficient number, since it is larger than the sum of its proper divisors (26556644).

31135228 is a wasteful number, since it uses less digits than its factorization.

31135228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457892 (or 457890 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 31135228 is about 5579.8949810906. The cubic root of 31135228 is about 314.5941796747.

The spelling of 31135228 in words is "thirty-one million, one hundred thirty-five thousand, two hundred twenty-eight".