81060439 has 2 divisors, whose sum is σ = 81060440. Its totient is φ = 81060438.

The previous prime is 81060433. The next prime is 81060457. The reversal of 81060439 is 93406018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81060439 - 2⁵ = 81060407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81060439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81060433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40530219 + 40530220.

It is an arithmetic number, because the mean of its divisors is an integer number (40530220).

Almost surely, 2^81060439 is an apocalyptic number.

81060439 is a deficient number, since it is larger than the sum of its proper divisors (1).

81060439 is an equidigital number, since it uses as much as digits as its factorization.

81060439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81060439 is about 9003.3570961059. The cubic root of 81060439 is about 432.7824593025.

The spelling of 81060439 in words is "eighty-one million, sixty thousand, four hundred thirty-nine".