31228103 has 4 divisors (see below), whose sum is σ = 31257768. Its totient is φ = 31198440.

The previous prime is 31228081. The next prime is 31228117. The reversal of 31228103 is 30182213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31228103 - 2¹² = 31224007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31228193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13193 + ... + 15378.

It is an arithmetic number, because the mean of its divisors is an integer number (7814442).

Almost surely, 2^31228103 is an apocalyptic number.

31228103 is a deficient number, since it is larger than the sum of its proper divisors (29665).

31228103 is a wasteful number, since it uses less digits than its factorization.

31228103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29664.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31228103 is about 5588.2110733221. The cubic root of 31228103 is about 314.9066759736.

The spelling of 31228103 in words is "thirty-one million, two hundred twenty-eight thousand, one hundred three".