30987812881 has 2 divisors, whose sum is σ = 30987812882. Its totient is φ = 30987812880.

The previous prime is 30987812837. The next prime is 30987812923. The reversal of 30987812881 is 18821878903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30322998225 + 664814656 = 174135^2 + 25784^2 .

It is a cyclic number.

It is not a de Polignac number, because 30987812881 - 2⁹ = 30987812369 is a prime.

It is a super-2 number, since 2×30987812881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30987812831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15493906440 + 15493906441.

It is an arithmetic number, because the mean of its divisors is an integer number (15493906441).

Almost surely, 2^30987812881 is an apocalyptic number.

It is an amenable number.

30987812881 is a deficient number, since it is larger than the sum of its proper divisors (1).

30987812881 is an equidigital number, since it uses as much as digits as its factorization.

30987812881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 55.

The spelling of 30987812881 in words is "thirty billion, nine hundred eighty-seven million, eight hundred twelve thousand, eight hundred eighty-one".