65439081 has 6 divisors (see below), whose sum is σ = 94523130. Its totient is φ = 43626048.

The previous prime is 65439079. The next prime is 65439107. The reversal of 65439081 is 18093456.

It can be written as a sum of positive squares in only one way, i.e., 58982400 + 6456681 = 7680^2 + 2541^2 .

It is not a de Polignac number, because 65439081 - 2¹ = 65439079 is a prime.

It is a super-2 number, since 2×65439081² = 8564546644249122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65439041) 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, 3635496 + ... + 3635513.

It is an arithmetic number, because the mean of its divisors is an integer number (15753855).

Almost surely, 2^65439081 is an apocalyptic number.

It is an amenable number.

65439081 is a deficient number, since it is larger than the sum of its proper divisors (29084049).

65439081 is a wasteful number, since it uses less digits than its factorization.

65439081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7271015 (or 7271012 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 65439081 is about 8089.4425642315. The cubic root of 65439081 is about 402.9758906983.

The spelling of 65439081 in words is "sixty-five million, four hundred thirty-nine thousand, eighty-one".