30138071081 has 2 divisors, whose sum is σ = 30138071082. Its totient is φ = 30138071080.

The previous prime is 30138071069. The next prime is 30138071083. The reversal of 30138071081 is 18017083103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20424983056 + 9713088025 = 142916^2 + 98555^2 .

It is a cyclic number.

It is not a de Polignac number, because 30138071081 - 2¹⁴ = 30138054697 is a prime.

It is a super-2 number, since 2×30138071081² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 30138071083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30138071083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15069035540 + 15069035541.

It is an arithmetic number, because the mean of its divisors is an integer number (15069035541).

Almost surely, 2^30138071081 is an apocalyptic number.

It is an amenable number.

30138071081 is a deficient number, since it is larger than the sum of its proper divisors (1).

30138071081 is an equidigital number, since it uses as much as digits as its factorization.

30138071081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 30138071081 in words is "thirty billion, one hundred thirty-eight million, seventy-one thousand, eighty-one".