64131565 has 8 divisors (see below), whose sum is σ = 81484920. Its totient is φ = 48287232.

The previous prime is 64131563. The next prime is 64131601. The reversal of 64131565 is 56513146.

It can be written as a sum of positive squares in 4 ways, for example, as 2869636 + 61261929 = 1694^2 + 7827^2 .

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 64131565 - 2¹ = 64131563 is a prime.

It is a super-2 number, since 2×64131565² = 8225715258698450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64131563) 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, 377160 + ... + 377329.

It is an arithmetic number, because the mean of its divisors is an integer number (10185615).

Almost surely, 2^64131565 is an apocalyptic number.

It is an amenable number.

64131565 is a deficient number, since it is larger than the sum of its proper divisors (17353355).

64131565 is a wasteful number, since it uses less digits than its factorization.

64131565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754511.

The product of its digits is 10800, while the sum is 31.

The square root of 64131565 is about 8008.2185909227. The cubic root of 64131565 is about 400.2739061457.

The spelling of 64131565 in words is "sixty-four million, one hundred thirty-one thousand, five hundred sixty-five".