30129761 has 2 divisors, whose sum is σ = 30129762. Its totient is φ = 30129760.

The previous prime is 30129751. The next prime is 30129787. The reversal of 30129761 is 16792103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 13278736 = 4105^2 + 3644^2 .

It is an emirp because it is prime and its reverse (16792103) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30129761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30129721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15064880 + 15064881.

It is an arithmetic number, because the mean of its divisors is an integer number (15064881).

Almost surely, 2^30129761 is an apocalyptic number.

It is an amenable number.

30129761 is a deficient number, since it is larger than the sum of its proper divisors (1).

30129761 is an equidigital number, since it uses as much as digits as its factorization.

30129761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 30129761 is about 5489.0582981054. The cubic root of 30129761 is about 311.1706035557.

The spelling of 30129761 in words is "thirty million, one hundred twenty-nine thousand, seven hundred sixty-one".