81030193031 has 16 divisors (see below), whose sum is σ = 87045023520. Its totient is φ = 75162086400.

The previous prime is 81030192967. The next prime is 81030193037. The reversal of 81030193031 is 13039103018.

It is not a de Polignac number, because 81030193031 - 2⁶ = 81030192967 is a prime.

It is a super-2 number, since 2×81030193031² (a number of 23 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 = 81030192985 and 81030193003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030193037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198581 + ... + 448881.

It is an arithmetic number, because the mean of its divisors is an integer number (5440313970).

Almost surely, 2^81030193031 is an apocalyptic number.

81030193031 is a deficient number, since it is larger than the sum of its proper divisors (6014830489).

81030193031 is a wasteful number, since it uses less digits than its factorization.

81030193031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250594.

The product of its (nonzero) digits is 1944, while the sum is 29.

Adding to 81030193031 its reverse (13039103018), we get a palindrome (94069296049).

The spelling of 81030193031 in words is "eighty-one billion, thirty million, one hundred ninety-three thousand, thirty-one".