81740601 has 6 divisors (see below), whose sum is σ = 118069770. Its totient is φ = 54493728.

The previous prime is 81740599. The next prime is 81740609. The reversal of 81740601 is 10604718.

It is a happy number.

81740601 is a `hidden beast` number, since 8 + 17 + 40 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81432576 + 308025 = 9024^2 + 555^2 .

It is not a de Polignac number, because 81740601 - 2¹ = 81740599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81740609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4541136 + ... + 4541153.

It is an arithmetic number, because the mean of its divisors is an integer number (19678295).

Almost surely, 2^81740601 is an apocalyptic number.

It is an amenable number.

81740601 is a deficient number, since it is larger than the sum of its proper divisors (36329169).

81740601 is a wasteful number, since it uses less digits than its factorization.

81740601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9082295 (or 9082292 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81740601 is about 9041.0508791843. The cubic root of 81740601 is about 433.9895532182.

The spelling of 81740601 in words is "eighty-one million, seven hundred forty thousand, six hundred one".