65251513 has 4 divisors (see below), whose sum is σ = 65332980. Its totient is φ = 65170048.

The previous prime is 65251477. The next prime is 65251519. The reversal of 65251513 is 31515256.

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 63154809 + 2096704 = 7947^2 + 1448^2 .

It is a cyclic number.

It is not a de Polignac number, because 65251513 - 2¹⁷ = 65120441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65251519) 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, 39520 + ... + 41137.

It is an arithmetic number, because the mean of its divisors is an integer number (16333245).

Almost surely, 2^65251513 is an apocalyptic number.

It is an amenable number.

65251513 is a deficient number, since it is larger than the sum of its proper divisors (81467).

65251513 is an equidigital number, since it uses as much as digits as its factorization.

65251513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81466.

The product of its digits is 4500, while the sum is 28.

The square root of 65251513 is about 8077.8408625078. The cubic root of 65251513 is about 402.5905057331.

Adding to 65251513 its reverse (31515256), we get a palindrome (96766769).

The spelling of 65251513 in words is "sixty-five million, two hundred fifty-one thousand, five hundred thirteen".