7851540813 has 8 divisors (see below), whose sum is σ = 10469695776. Its totient is φ = 5233873200.

The previous prime is 7851540803. The next prime is 7851540833. The reversal of 7851540813 is 3180451587.

7851540813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-7851540813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7851540803) 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, 82423 + ... + 149988.

It is an arithmetic number, because the mean of its divisors is an integer number (1308711972).

Almost surely, 2^7851540813 is an apocalyptic number.

It is an amenable number.

7851540813 is a deficient number, since it is larger than the sum of its proper divisors (2618154963).

7851540813 is a wasteful number, since it uses less digits than its factorization.

7851540813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243675.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 7851540813 is about 88608.9206175089. The cubic root of 7851540813 is about 1987.5510739773.

The spelling of 7851540813 in words is "seven billion, eight hundred fifty-one million, five hundred forty thousand, eight hundred thirteen".