65491513 has 4 divisors (see below), whose sum is σ = 65602548. Its totient is φ = 65380480.

The previous prime is 65491507. The next prime is 65491519. The reversal of 65491513 is 31519456.

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

It is an interprime number because it is at equal distance from previous prime (65491507) and next prime (65491519).

It can be written as a sum of positive squares in 2 ways, for example, as 25080064 + 40411449 = 5008^2 + 6357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65491513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65491519) 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, 54628 + ... + 55813.

It is an arithmetic number, because the mean of its divisors is an integer number (16400637).

Almost surely, 2^65491513 is an apocalyptic number.

It is an amenable number.

65491513 is a deficient number, since it is larger than the sum of its proper divisors (111035).

65491513 is a wasteful number, since it uses less digits than its factorization.

65491513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111034.

The product of its digits is 16200, while the sum is 34.

The square root of 65491513 is about 8092.6826825225. The cubic root of 65491513 is about 403.0834879274.

The spelling of 65491513 in words is "sixty-five million, four hundred ninety-one thousand, five hundred thirteen".