31228881 has 8 divisors (see below), whose sum is σ = 44087904. Its totient is φ = 19594560.

The previous prime is 31228867. The next prime is 31228903. The reversal of 31228881 is 18882213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31228881 - 2⁶ = 31228817 is a prime.

It is a super-2 number, since 2×31228881² = 1950486017024322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31228801) 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 7 ways as a sum of consecutive naturals, for example, 306115 + ... + 306216.

It is an arithmetic number, because the mean of its divisors is an integer number (5510988).

Almost surely, 2^31228881 is an apocalyptic number.

It is an amenable number.

31228881 is a deficient number, since it is larger than the sum of its proper divisors (12859023).

31228881 is a wasteful number, since it uses less digits than its factorization.

31228881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612351.

The product of its digits is 6144, while the sum is 33.

The square root of 31228881 is about 5588.2806837166. The cubic root of 31228881 is about 314.9092910899.

The spelling of 31228881 in words is "thirty-one million, two hundred twenty-eight thousand, eight hundred eighty-one".