81241611 has 16 divisors (see below), whose sum is σ = 118454400. Its totient is φ = 49118720.

The previous prime is 81241609. The next prime is 81241619. The reversal of 81241611 is 11614218.

It is a cyclic number.

It is not a de Polignac number, because 81241611 - 2¹ = 81241609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81241619) 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, 12076 + ... + 17558.

It is an arithmetic number, because the mean of its divisors is an integer number (7403400).

Almost surely, 2^81241611 is an apocalyptic number.

81241611 is a deficient number, since it is larger than the sum of its proper divisors (37212789).

81241611 is a wasteful number, since it uses less digits than its factorization.

81241611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its digits is 384, while the sum is 24.

The square root of 81241611 is about 9013.4128386533. The cubic root of 81241611 is about 433.1046457372.

Adding to 81241611 its reverse (11614218), we get a palindrome (92855829).

The spelling of 81241611 in words is "eighty-one million, two hundred forty-one thousand, six hundred eleven".