81081081051 has 8 divisors (see below), whose sum is σ = 108507032064. Its totient is φ = 53854592040.

The previous prime is 81081081031. The next prime is 81081081071. The reversal of 81081081051 is 15018018018.

It is an interprime number because it is at equal distance from previous prime (81081081031) and next prime (81081081071).

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

It is not a de Polignac number, because 81081081051 - 2²² = 81076886747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81081081031) 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, 49864551 + ... + 49866176.

It is an arithmetic number, because the mean of its divisors is an integer number (13563379008).

Almost surely, 2^81081081051 is an apocalyptic number.

81081081051 is a deficient number, since it is larger than the sum of its proper divisors (27425951013).

81081081051 is a wasteful number, since it uses less digits than its factorization.

81081081051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99731001.

The product of its (nonzero) digits is 2560, while the sum is 33.

Adding to 81081081051 its reverse (15018018018), we get a palindrome (96099099069).

The spelling of 81081081051 in words is "eighty-one billion, eighty-one million, eighty-one thousand, fifty-one".