81701365 has 16 divisors (see below), whose sum is σ = 101026800. Its totient is φ = 63383040.

The previous prime is 81701363. The next prime is 81701383. The reversal of 81701365 is 56310718.

It can be written as a sum of positive squares in 8 ways, for example, as 106276 + 81595089 = 326^2 + 9033^2 .

It is not a de Polignac number, because 81701365 - 2¹ = 81701363 is a prime.

It is a super-2 number, since 2×81701365² = 13350226085726450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81701363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77361 + ... + 78409.

It is an arithmetic number, because the mean of its divisors is an integer number (6314175).

Almost surely, 2^81701365 is an apocalyptic number.

It is an amenable number.

81701365 is a deficient number, since it is larger than the sum of its proper divisors (19325435).

81701365 is a wasteful number, since it uses less digits than its factorization.

81701365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 81701365 is about 9038.8807382330. The cubic root of 81701365 is about 433.9201028710.

The spelling of 81701365 in words is "eighty-one million, seven hundred one thousand, three hundred sixty-five".