31129103 has 4 divisors (see below), whose sum is σ = 31335408. Its totient is φ = 30922800.

The previous prime is 31129069. The next prime is 31129141. The reversal of 31129103 is 30192113.

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 31129103 - 2⁶ = 31129039 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 (31129303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102926 + ... + 103227.

It is an arithmetic number, because the mean of its divisors is an integer number (7833852).

Almost surely, 2^31129103 is an apocalyptic number.

31129103 is a deficient number, since it is larger than the sum of its proper divisors (206305).

31129103 is a wasteful number, since it uses less digits than its factorization.

31129103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206304.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31129103 is about 5579.3461086403. The cubic root of 31129103 is about 314.5735490702.

The spelling of 31129103 in words is "thirty-one million, one hundred twenty-nine thousand, one hundred three".