30129478381 has 2 divisors, whose sum is σ = 30129478382. Its totient is φ = 30129478380.

The previous prime is 30129478373. The next prime is 30129478427. The reversal of 30129478381 is 18387492103.

It is an a-pointer prime, because the next prime (30129478427) can be obtained adding 30129478381 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29434892356 + 694586025 = 171566^2 + 26355^2 .

It is an emirp because it is prime and its reverse (18387492103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30129478381 - 2³ = 30129478373 is a prime.

It is a super-2 number, since 2×30129478381² (a number of 22 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30129472381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15064739190 + 15064739191.

It is an arithmetic number, because the mean of its divisors is an integer number (15064739191).

Almost surely, 2^30129478381 is an apocalyptic number.

It is an amenable number.

30129478381 is a deficient number, since it is larger than the sum of its proper divisors (1).

30129478381 is an equidigital number, since it uses as much as digits as its factorization.

30129478381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 30129478381 in words is "thirty billion, one hundred twenty-nine million, four hundred seventy-eight thousand, three hundred eighty-one".