30123100181 has 2 divisors, whose sum is σ = 30123100182. Its totient is φ = 30123100180.

The previous prime is 30123100177. The next prime is 30123100229. The reversal of 30123100181 is 18100132103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30091840900 + 31259281 = 173470^2 + 5591^2 .

It is a cyclic number.

It is not a de Polignac number, because 30123100181 - 2² = 30123100177 is a prime.

It is a super-2 number, since 2×30123100181² (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 (30123100681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15061550090 + 15061550091.

It is an arithmetic number, because the mean of its divisors is an integer number (15061550091).

Almost surely, 2^30123100181 is an apocalyptic number.

It is an amenable number.

30123100181 is a deficient number, since it is larger than the sum of its proper divisors (1).

30123100181 is an equidigital number, since it uses as much as digits as its factorization.

30123100181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 30123100181 its reverse (18100132103), we get a palindrome (48223232284).

The spelling of 30123100181 in words is "thirty billion, one hundred twenty-three million, one hundred thousand, one hundred eighty-one".