81016061 has 6 divisors (see below), whose sum is σ = 94243230. Its totient is φ = 69442296.

The previous prime is 81016031. The next prime is 81016063. The reversal of 81016061 is 16061018.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 74736025 + 6280036 = 8645^2 + 2506^2 .

It is not a de Polignac number, because 81016061 - 2⁶ = 81015997 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 (81016063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 826646 + ... + 826743.

It is an arithmetic number, because the mean of its divisors is an integer number (15707205).

Almost surely, 2^81016061 is an apocalyptic number.

It is an amenable number.

81016061 is a deficient number, since it is larger than the sum of its proper divisors (13227169).

81016061 is a wasteful number, since it uses less digits than its factorization.

81016061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653403 (or 1653396 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 81016061 is about 9000.8922335511. The cubic root of 81016061 is about 432.7034666965.

Adding to 81016061 its reverse (16061018), we get a palindrome (97077079).

The spelling of 81016061 in words is "eighty-one million, sixteen thousand, sixty-one".