30000071561 has 2 divisors, whose sum is σ = 30000071562. Its totient is φ = 30000071560.

The previous prime is 30000071537. The next prime is 30000071609. The reversal of 30000071561 is 16517000003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18388716025 + 11611355536 = 135605^2 + 107756^2 .

It is a cyclic number.

It is not a de Polignac number, because 30000071561 - 2¹⁴ = 30000055177 is a prime.

It is not a weakly prime, because it can be changed into another prime (30000071461) 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, 15000035780 + 15000035781.

It is an arithmetic number, because the mean of its divisors is an integer number (15000035781).

Almost surely, 2^30000071561 is an apocalyptic number.

It is an amenable number.

30000071561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30000071561 is an equidigital number, since it uses as much as digits as its factorization.

30000071561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 23.

Adding to 30000071561 its reverse (16517000003), we get a palindrome (46517071564).

The spelling of 30000071561 in words is "thirty billion, seventy-one thousand, five hundred sixty-one".