65571389 has 4 divisors (see below), whose sum is σ = 70615356. Its totient is φ = 60527424.

The previous prime is 65571379. The next prime is 65571403. The reversal of 65571389 is 98317556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21548164 + 44023225 = 4642^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 65571389 - 2²⁴ = 48794173 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 (65571379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521964 + ... + 2521989.

It is an arithmetic number, because the mean of its divisors is an integer number (17653839).

Almost surely, 2^65571389 is an apocalyptic number.

It is an amenable number.

65571389 is a deficient number, since it is larger than the sum of its proper divisors (5043967).

65571389 is a wasteful number, since it uses less digits than its factorization.

65571389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043966.

The product of its digits is 226800, while the sum is 44.

The square root of 65571389 is about 8097.6162541825. The cubic root of 65571389 is about 403.2472934579.

The spelling of 65571389 in words is "sixty-five million, five hundred seventy-one thousand, three hundred eighty-nine".