30195139831 has 2 divisors, whose sum is σ = 30195139832. Its totient is φ = 30195139830.

The previous prime is 30195139813. The next prime is 30195139861. The reversal of 30195139831 is 13893159103.

Together with previous prime (30195139813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30195139831 - 2²³ = 30186751223 is a prime.

It is a super-2 number, since 2×30195139831² (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 (30195139811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15097569915 + 15097569916.

It is an arithmetic number, because the mean of its divisors is an integer number (15097569916).

Almost surely, 2^30195139831 is an apocalyptic number.

30195139831 is a deficient number, since it is larger than the sum of its proper divisors (1).

30195139831 is an equidigital number, since it uses as much as digits as its factorization.

30195139831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 30195139831 in words is "thirty billion, one hundred ninety-five million, one hundred thirty-nine thousand, eight hundred thirty-one".