30525049981 has 2 divisors, whose sum is σ = 30525049982. Its totient is φ = 30525049980.

The previous prime is 30525049979. The next prime is 30525050051. The reversal of 30525049981 is 18994052503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29975381956 + 549668025 = 173134^2 + 23445^2 .

It is a cyclic number.

It is not a de Polignac number, because 30525049981 - 2¹ = 30525049979 is a prime.

It is a super-2 number, since 2×30525049981² (a number of 22 digits) contains 22 as substring.

Together with 30525049979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30525049901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15262524990 + 15262524991.

It is an arithmetic number, because the mean of its divisors is an integer number (15262524991).

Almost surely, 2^30525049981 is an apocalyptic number.

It is an amenable number.

30525049981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30525049981 is an equidigital number, since it uses as much as digits as its factorization.

30525049981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 30525049981 in words is "thirty billion, five hundred twenty-five million, forty-nine thousand, nine hundred eighty-one".