30994891 has 2 divisors, whose sum is σ = 30994892. Its totient is φ = 30994890.

The previous prime is 30994879. The next prime is 30994897. The reversal of 30994891 is 19849903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30994891 - 2⁷ = 30994763 is a prime.

It is not a weakly prime, because it can be changed into another prime (30994897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15497445 + 15497446.

It is an arithmetic number, because the mean of its divisors is an integer number (15497446).

Almost surely, 2^30994891 is an apocalyptic number.

30994891 is a deficient number, since it is larger than the sum of its proper divisors (1).

30994891 is an equidigital number, since it uses as much as digits as its factorization.

30994891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 30994891 is about 5567.3055421811. The cubic root of 30994891 is about 314.1208069644.

The spelling of 30994891 in words is "thirty million, nine hundred ninety-four thousand, eight hundred ninety-one".