81034010781 has 8 divisors (see below), whose sum is σ = 109159217664. Its totient is φ = 53465738880.

The previous prime is 81034010773. The next prime is 81034010801. The reversal of 81034010781 is 18701043018.

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

It is not a de Polignac number, because 81034010781 - 2³ = 81034010773 is a prime.

It is a super-2 number, since 2×81034010781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81034010581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139233405 + ... + 139233986.

It is an arithmetic number, because the mean of its divisors is an integer number (13644902208).

Almost surely, 2^81034010781 is an apocalyptic number.

It is an amenable number.

81034010781 is a deficient number, since it is larger than the sum of its proper divisors (28125206883).

81034010781 is a wasteful number, since it uses less digits than its factorization.

81034010781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278467491.

The product of its (nonzero) digits is 5376, while the sum is 33.

Adding to 81034010781 its reverse (18701043018), we get a palindrome (99735053799).

It can be divided in two parts, 810340 and 10781, that added together give a triangular number (821121 = T₁₂₈₁).

The spelling of 81034010781 in words is "eighty-one billion, thirty-four million, ten thousand, seven hundred eighty-one".