8181581751031 has 16 divisors (see below), whose sum is σ = 9194583835584. Its totient is φ = 7223427154944.

The previous prime is 8181581751023. The next prime is 8181581751041. The reversal of 8181581751031 is 1301571851818.

It is not a de Polignac number, because 8181581751031 - 2³ = 8181581751023 is a prime.

It is a super-2 number, since 2×8181581751031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181581751041) 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 15 ways as a sum of consecutive naturals, for example, 4075305 + ... + 5742061.

It is an arithmetic number, because the mean of its divisors is an integer number (574661489724).

Almost surely, 2^{8181581751031} is an apocalyptic number.

8181581751031 is a deficient number, since it is larger than the sum of its proper divisors (1013002084553).

8181581751031 is a wasteful number, since it uses less digits than its factorization.

8181581751031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683210.

The product of its (nonzero) digits is 268800, while the sum is 49.

The spelling of 8181581751031 in words is "eight trillion, one hundred eighty-one billion, five hundred eighty-one million, seven hundred fifty-one thousand, thirty-one".