30129997 has 2 divisors, whose sum is σ = 30129998. Its totient is φ = 30129996.

The previous prime is 30129989. The next prime is 30130003. The reversal of 30129997 is 79992103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 4435236 = 5069^2 + 2106^2 .

It is an emirp because it is prime and its reverse (79992103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30129997 - 2³ = 30129989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30129907) 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, 15064998 + 15064999.

It is an arithmetic number, because the mean of its divisors is an integer number (15064999).

Almost surely, 2^30129997 is an apocalyptic number.

It is an amenable number.

30129997 is a deficient number, since it is larger than the sum of its proper divisors (1).

30129997 is an equidigital number, since it uses as much as digits as its factorization.

30129997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 30129997 is about 5489.0797953755. The cubic root of 30129997 is about 311.1714159979.

The spelling of 30129997 in words is "thirty million, one hundred twenty-nine thousand, nine hundred ninety-seven".