30136861 has 2 divisors, whose sum is σ = 30136862. Its totient is φ = 30136860.

The previous prime is 30136859. The next prime is 30136891. The reversal of 30136861 is 16863103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29224836 + 912025 = 5406^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 30136861 - 2¹ = 30136859 is a prime.

Together with 30136859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30136811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15068430 + 15068431.

It is an arithmetic number, because the mean of its divisors is an integer number (15068431).

Almost surely, 2^30136861 is an apocalyptic number.

It is an amenable number.

30136861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30136861 is an equidigital number, since it uses as much as digits as its factorization.

30136861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 30136861 is about 5489.7050011818. The cubic root of 30136861 is about 311.1950438178.

Adding to 30136861 its reverse (16863103), we get a palindrome (46999964).

The spelling of 30136861 in words is "thirty million, one hundred thirty-six thousand, eight hundred sixty-one".