81740201 has 12 divisors (see below), whose sum is σ = 84213360. Its totient is φ = 79330680.

The previous prime is 81740179. The next prime is 81740213. The reversal of 81740201 is 10204718.

It is not a de Polignac number, because 81740201 - 2¹⁸ = 81478057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81740221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 587990 + ... + 588128.

It is an arithmetic number, because the mean of its divisors is an integer number (7017780).

Almost surely, 2^81740201 is an apocalyptic number.

It is an amenable number.

81740201 is a deficient number, since it is larger than the sum of its proper divisors (2473159).

81740201 is a wasteful number, since it uses less digits than its factorization.

81740201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81740201 is about 9041.0287578350. The cubic root of 81740201 is about 433.9888453036.

Adding to 81740201 its reverse (10204718), we get a palindrome (91944919).

The spelling of 81740201 in words is "eighty-one million, seven hundred forty thousand, two hundred one".