81121112061 has 16 divisors (see below), whose sum is σ = 118059947328. Its totient is φ = 49136976000.

The previous prime is 81121112003. The next prime is 81121112071. The reversal of 81121112061 is 16021112118.

It is not a de Polignac number, because 81121112061 - 2⁶ = 81121111997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81121112071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623026 + ... + 741891.

It is an arithmetic number, because the mean of its divisors is an integer number (7378746708).

Almost surely, 2^81121112061 is an apocalyptic number.

It is an amenable number.

81121112061 is a deficient number, since it is larger than the sum of its proper divisors (36938835267).

81121112061 is a wasteful number, since it uses less digits than its factorization.

81121112061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366732.

The product of its (nonzero) digits is 192, while the sum is 24.

Adding to 81121112061 its reverse (16021112118), we get a palindrome (97142224179).

The spelling of 81121112061 in words is "eighty-one billion, one hundred twenty-one million, one hundred twelve thousand, sixty-one".