30139022981 has 2 divisors, whose sum is σ = 30139022982. Its totient is φ = 30139022980.

The previous prime is 30139022933. The next prime is 30139022987. The reversal of 30139022981 is 18922093103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27758558881 + 2380464100 = 166609^2 + 48790^2 .

It is a cyclic number.

It is not a de Polignac number, because 30139022981 - 2³⁴ = 12959153797 is a prime.

It is a super-2 number, since 2×30139022981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30139022987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15069511490 + 15069511491.

It is an arithmetic number, because the mean of its divisors is an integer number (15069511491).

Almost surely, 2^30139022981 is an apocalyptic number.

It is an amenable number.

30139022981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30139022981 is an equidigital number, since it uses as much as digits as its factorization.

30139022981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 30139022981 in words is "thirty billion, one hundred thirty-nine million, twenty-two thousand, nine hundred eighty-one".