30890861 has 2 divisors, whose sum is σ = 30890862. Its totient is φ = 30890860.

The previous prime is 30890851. The next prime is 30890869. The reversal of 30890861 is 16809803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 7946761 = 4790^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 30890861 - 2²² = 26696557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30890869) 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, 15445430 + 15445431.

It is an arithmetic number, because the mean of its divisors is an integer number (15445431).

Almost surely, 2^30890861 is an apocalyptic number.

It is an amenable number.

30890861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30890861 is an equidigital number, since it uses as much as digits as its factorization.

30890861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 30890861 is about 5557.9547497258. The cubic root of 30890861 is about 313.7689789210.

The spelling of 30890861 in words is "thirty million, eight hundred ninety thousand, eight hundred sixty-one".