81120061 has 8 divisors (see below), whose sum is σ = 88560864. Its totient is φ = 73690320.

The previous prime is 81120007. The next prime is 81120071. The reversal of 81120061 is 16002118.

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

It is not a de Polignac number, because 81120061 - 2⁷ = 81119933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81120001) 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, 23311 + ... + 26563.

It is an arithmetic number, because the mean of its divisors is an integer number (11070108).

Almost surely, 2^81120061 is an apocalyptic number.

It is an amenable number.

81120061 is a deficient number, since it is larger than the sum of its proper divisors (7440803).

81120061 is a wasteful number, since it uses less digits than its factorization.

81120061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 81120061 is about 9006.6675857389. The cubic root of 81120061 is about 432.8885407743. Note that the first 3 decimals are identical.

Adding to 81120061 its reverse (16002118), we get a palindrome (97122179).

The spelling of 81120061 in words is "eighty-one million, one hundred twenty thousand, sixty-one".