30988828681 has 4 divisors (see below), whose sum is σ = 31194052864. Its totient is φ = 30783604500.

The previous prime is 30988828679. The next prime is 30988828721. The reversal of 30988828681 is 18682888903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30988828681 - 2¹ = 30988828679 is a prime.

It is a super-2 number, since 2×30988828681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30988828631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102611865 + ... + 102612166.

It is an arithmetic number, because the mean of its divisors is an integer number (7798513216).

Almost surely, 2^30988828681 is an apocalyptic number.

It is an amenable number.

30988828681 is a deficient number, since it is larger than the sum of its proper divisors (205224183).

30988828681 is a wasteful number, since it uses less digits than its factorization.

30988828681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205224182.

The product of its (nonzero) digits is 10616832, while the sum is 61.

The spelling of 30988828681 in words is "thirty billion, nine hundred eighty-eight million, eight hundred twenty-eight thousand, six hundred eighty-one".