81345061 has 16 divisors (see below), whose sum is σ = 98396800. Its totient is φ = 65691648.

The previous prime is 81345049. The next prime is 81345067. The reversal of 81345061 is 16054318.

It is a cyclic number.

It is not a de Polignac number, because 81345061 - 2¹⁵ = 81312293 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 (81345067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24085 + ... + 27253.

It is an arithmetic number, because the mean of its divisors is an integer number (6149800).

Almost surely, 2^81345061 is an apocalyptic number.

It is an amenable number.

81345061 is a deficient number, since it is larger than the sum of its proper divisors (17051739).

81345061 is a wasteful number, since it uses less digits than its factorization.

81345061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81345061 is about 9019.1496827583. The cubic root of 81345061 is about 433.2884007980.

Adding to 81345061 its reverse (16054318), we get a palindrome (97399379).

The spelling of 81345061 in words is "eighty-one million, three hundred forty-five thousand, sixty-one".