30109861 has 2 divisors, whose sum is σ = 30109862. Its totient is φ = 30109860.

The previous prime is 30109837. The next prime is 30109903. The reversal of 30109861 is 16890103.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 352836 = 5455^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 30109861 - 2¹⁹ = 29585573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30109811) 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, 15054930 + 15054931.

It is an arithmetic number, because the mean of its divisors is an integer number (15054931).

Almost surely, 2^30109861 is an apocalyptic number.

It is an amenable number.

30109861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30109861 is an equidigital number, since it uses as much as digits as its factorization.

30109861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 30109861 is about 5487.2453016063. The cubic root of 30109861 is about 311.1020815076.

Adding to 30109861 its reverse (16890103), we get a palindrome (46999964).

The spelling of 30109861 in words is "thirty million, one hundred nine thousand, eight hundred sixty-one".