30281322581 has 2 divisors, whose sum is σ = 30281322582. Its totient is φ = 30281322580.

The previous prime is 30281322553. The next prime is 30281322593. The reversal of 30281322581 is 18522318203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23649826225 + 6631496356 = 153785^2 + 81434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30281322581 is a prime.

It is a super-2 number, since 2×30281322581² (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 (30281322521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15140661290 + 15140661291.

It is an arithmetic number, because the mean of its divisors is an integer number (15140661291).

Almost surely, 2^30281322581 is an apocalyptic number.

It is an amenable number.

30281322581 is a deficient number, since it is larger than the sum of its proper divisors (1).

30281322581 is an equidigital number, since it uses as much as digits as its factorization.

30281322581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 30281322581 in words is "thirty billion, two hundred eighty-one million, three hundred twenty-two thousand, five hundred eighty-one".