81049061 has 4 divisors (see below), whose sum is σ = 81144492. Its totient is φ = 80953632.

The previous prime is 81049051. The next prime is 81049091. The reversal of 81049061 is 16094018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 3062500 = 8831^2 + 1750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81049061 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 (81049051) 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, 46430 + ... + 48143.

It is an arithmetic number, because the mean of its divisors is an integer number (20286123).

Almost surely, 2^81049061 is an apocalyptic number.

It is an amenable number.

81049061 is a deficient number, since it is larger than the sum of its proper divisors (95431).

81049061 is an equidigital number, since it uses as much as digits as its factorization.

81049061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95430.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 81049061 is about 9002.7251985163. The cubic root of 81049061 is about 432.7622092714.

The spelling of 81049061 in words is "eighty-one million, forty-nine thousand, sixty-one".