65439901 has 8 divisors (see below), whose sum is σ = 66499064. Its totient is φ = 64385280.

The previous prime is 65439893. The next prime is 65439911. The reversal of 65439901 is 10993456.

It can be written as a sum of positive squares in 4 ways, for example, as 5067001 + 60372900 = 2251^2 + 7770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65439901 - 2³ = 65439893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65439911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38665 + ... + 40321.

It is an arithmetic number, because the mean of its divisors is an integer number (8312383).

Almost surely, 2^65439901 is an apocalyptic number.

It is an amenable number.

65439901 is a deficient number, since it is larger than the sum of its proper divisors (1059163).

65439901 is a wasteful number, since it uses less digits than its factorization.

65439901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 65439901 is about 8089.4932474167. The cubic root of 65439901 is about 402.9775738864.

The spelling of 65439901 in words is "sixty-five million, four hundred thirty-nine thousand, nine hundred one".