81081503431 has 8 divisors (see below), whose sum is σ = 86622817280. Its totient is φ = 75667576248.

The previous prime is 81081503423. The next prime is 81081503441. The reversal of 81081503431 is 13430518018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81081503431 - 2³ = 81081503423 is a prime.

It is a super-2 number, since 2×81081503431² (a number of 23 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 (81081503441) 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 in 7 ways as a sum of consecutive naturals, for example, 31845351 + ... + 31847896.

It is an arithmetic number, because the mean of its divisors is an integer number (10827852160).

Almost surely, 2^81081503431 is an apocalyptic number.

81081503431 is a deficient number, since it is larger than the sum of its proper divisors (5541313849).

81081503431 is a wasteful number, since it uses less digits than its factorization.

81081503431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63693333.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 81081503431 in words is "eighty-one billion, eighty-one million, five hundred three thousand, four hundred thirty-one".