30131220031 has 4 divisors (see below), whose sum is σ = 32870421864. Its totient is φ = 27392018200.

The previous prime is 30131219971. The next prime is 30131220113. The reversal of 30131220031 is 13002213103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13002213103 = 11 ⋅1182019373.

It is a cyclic number.

It is not a de Polignac number, because 30131220031 - 2⁷ = 30131219903 is a prime.

It is a super-2 number, since 2×30131220031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30131219987 and 30131220014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30131220131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369600900 + ... + 1369600921.

It is an arithmetic number, because the mean of its divisors is an integer number (8217605466).

Almost surely, 2^30131220031 is an apocalyptic number.

30131220031 is a deficient number, since it is larger than the sum of its proper divisors (2739201833).

30131220031 is a wasteful number, since it uses less digits than its factorization.

30131220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739201832.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 30131220031 its reverse (13002213103), we get a palindrome (43133433134).

The spelling of 30131220031 in words is "thirty billion, one hundred thirty-one million, two hundred twenty thousand, thirty-one".