30991043 has 2 divisors, whose sum is σ = 30991044. Its totient is φ = 30991042.

The previous prime is 30991031. The next prime is 30991067. The reversal of 30991043 is 34019903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30991043 - 2¹⁰ = 30990019 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30990997 and 30991015.

It is not a weakly prime, because it can be changed into another prime (30991013) 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 as a sum of consecutive naturals, namely, 15495521 + 15495522.

It is an arithmetic number, because the mean of its divisors is an integer number (15495522).

Almost surely, 2^30991043 is an apocalyptic number.

30991043 is a deficient number, since it is larger than the sum of its proper divisors (1).

30991043 is an equidigital number, since it uses as much as digits as its factorization.

30991043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 30991043 is about 5566.9599423743. The cubic root of 30991043 is about 314.1078071134.

The spelling of 30991043 in words is "thirty million, nine hundred ninety-one thousand, forty-three".