7851242513 has 4 divisors (see below), whose sum is σ = 7984314480. Its totient is φ = 7718170548.

The previous prime is 7851242507. The next prime is 7851242521. The reversal of 7851242513 is 3152421587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3152421587 = 7 ⋅450345941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7851242513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7851242563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66535895 + ... + 66536012.

It is an arithmetic number, because the mean of its divisors is an integer number (1996078620).

Almost surely, 2^7851242513 is an apocalyptic number.

It is an amenable number.

7851242513 is a deficient number, since it is larger than the sum of its proper divisors (133071967).

7851242513 is a wasteful number, since it uses less digits than its factorization.

7851242513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133071966.

The product of its digits is 67200, while the sum is 38.

The square root of 7851242513 is about 88607.2373624187. The cubic root of 7851242513 is about 1987.5259029521.

The spelling of 7851242513 in words is "seven billion, eight hundred fifty-one million, two hundred forty-two thousand, five hundred thirteen".