81014641 has 2 divisors, whose sum is σ = 81014642. Its totient is φ = 81014640.

The previous prime is 81014627. The next prime is 81014657. The reversal of 81014641 is 14641018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81000000 + 14641 = 9000^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 81014641 - 2⁷ = 81014513 is a prime.

It is not a weakly prime, because it can be changed into another prime (81044641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40507320 + 40507321.

It is an arithmetic number, because the mean of its divisors is an integer number (40507321).

Almost surely, 2^81014641 is an apocalyptic number.

It is an amenable number.

81014641 is a deficient number, since it is larger than the sum of its proper divisors (1).

81014641 is an equidigital number, since it uses as much as digits as its factorization.

81014641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81014641 is about 9000.8133521366. The cubic root of 81014641 is about 432.7009386278.

Adding to 81014641 its reverse (14641018), we get a palindrome (95655659).

It can be divided in two parts, 810 and 14641, that added together give a palindrome (15451).

The spelling of 81014641 in words is "eighty-one million, fourteen thousand, six hundred forty-one".