31103929 has 2 divisors, whose sum is σ = 31103930. Its totient is φ = 31103928.

The previous prime is 31103911. The next prime is 31103957. The reversal of 31103929 is 92930113.

It is an a-pointer prime, because the next prime (31103957) can be obtained adding 31103929 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 13690000 = 4173^2 + 3700^2 .

It is an emirp because it is prime and its reverse (92930113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31103929 - 2⁹ = 31103417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31103897 and 31103906.

It is not a weakly prime, because it can be changed into another prime (31103909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551964 + 15551965.

It is an arithmetic number, because the mean of its divisors is an integer number (15551965).

Almost surely, 2^31103929 is an apocalyptic number.

It is an amenable number.

31103929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103929 is an equidigital number, since it uses as much as digits as its factorization.

31103929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 31103929 is about 5577.0896532152. The cubic root of 31103929 is about 314.4887280139.

The spelling of 31103929 in words is "thirty-one million, one hundred three thousand, nine hundred twenty-nine".