68461513 has 4 divisors (see below), whose sum is σ = 70131348. Its totient is φ = 66791680.

The previous prime is 68461457. The next prime is 68461529. The reversal of 68461513 is 31516486.

It is a happy number.

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 40551424 + 27910089 = 6368^2 + 5283^2 .

It is a cyclic number.

It is not a de Polignac number, because 68461513 - 2¹³ = 68453321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68461553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834856 + ... + 834937.

It is an arithmetic number, because the mean of its divisors is an integer number (17532837).

Almost surely, 2^68461513 is an apocalyptic number.

It is an amenable number.

68461513 is a deficient number, since it is larger than the sum of its proper divisors (1669835).

68461513 is a wasteful number, since it uses less digits than its factorization.

68461513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669834.

The product of its digits is 17280, while the sum is 34.

The square root of 68461513 is about 8274.1472672415. The cubic root of 68461513 is about 409.0868294438.

Adding to 68461513 its reverse (31516486), we get a palindrome (99977999).

The spelling of 68461513 in words is "sixty-eight million, four hundred sixty-one thousand, five hundred thirteen".