31228331 has 8 divisors (see below), whose sum is σ = 32367600. Its totient is φ = 30093280.

The previous prime is 31228313. The next prime is 31228361. The reversal of 31228331 is 13382213.

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

It is a cyclic number.

It is not a de Polignac number, because 31228331 - 2²² = 27034027 is a prime.

It is a super-2 number, since 2×31228331² = 1950417314091122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31228297 and 31228306.

It is not an unprimeable number, because it can be changed into a prime (31228361) 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, 27605 + ... + 28713.

It is an arithmetic number, because the mean of its divisors is an integer number (4045950).

Almost surely, 2^31228331 is an apocalyptic number.

31228331 is a deficient number, since it is larger than the sum of its proper divisors (1139269).

31228331 is a wasteful number, since it uses less digits than its factorization.

31228331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109.

The product of its digits is 864, while the sum is 23.

The square root of 31228331 is about 5588.2314733733. The cubic root of 31228331 is about 314.9074423618.

The spelling of 31228331 in words is "thirty-one million, two hundred twenty-eight thousand, three hundred thirty-one".