31121039 has 2 divisors, whose sum is σ = 31121040. Its totient is φ = 31121038.

The previous prime is 31121021. The next prime is 31121059. The reversal of 31121039 is 93012113.

It is an a-pointer prime, because the next prime (31121059) can be obtained adding 31121039 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121039 - 2²⁰ = 30072463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31121039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121059) 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 as a sum of consecutive naturals, namely, 15560519 + 15560520.

It is an arithmetic number, because the mean of its divisors is an integer number (15560520).

Almost surely, 2^31121039 is an apocalyptic number.

31121039 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121039 is an equidigital number, since it uses as much as digits as its factorization.

31121039 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31121039 is about 5578.6233965020. The cubic root of 31121039 is about 314.5463832786.

The spelling of 31121039 in words is "thirty-one million, one hundred twenty-one thousand, thirty-nine".