81014681 has 4 divisors (see below), whose sum is σ = 88379664. Its totient is φ = 73649700.

The previous prime is 81014663. The next prime is 81014767. The reversal of 81014681 is 18641018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81014681 - 2⁶ = 81014617 is a prime.

It is a super-2 number, since 2×81014681² = 13126757075063522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81014641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3682475 + ... + 3682496.

It is an arithmetic number, because the mean of its divisors is an integer number (22094916).

Almost surely, 2^81014681 is an apocalyptic number.

It is an amenable number.

81014681 is a deficient number, since it is larger than the sum of its proper divisors (7364983).

81014681 is a wasteful number, since it uses less digits than its factorization.

81014681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364982.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 81014681 is about 9000.8155741577. The cubic root of 81014681 is about 432.7010098414.

Adding to 81014681 its reverse (18641018), we get a palindrome (99655699).

The spelling of 81014681 in words is "eighty-one million, fourteen thousand, six hundred eighty-one".