9878815493 has 2 divisors, whose sum is σ = 9878815494. Its totient is φ = 9878815492.

The previous prime is 9878815451. The next prime is 9878815501. The reversal of 9878815493 is 3945188789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8093161444 + 1785654049 = 89962^2 + 42257^2 .

It is a cyclic number.

It is not a de Polignac number, because 9878815493 - 2⁸ = 9878815237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9878815423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939407746 + 4939407747.

It is an arithmetic number, because the mean of its divisors is an integer number (4939407747).

Almost surely, 2^9878815493 is an apocalyptic number.

It is an amenable number.

9878815493 is a deficient number, since it is larger than the sum of its proper divisors (1).

9878815493 is an equidigital number, since it uses as much as digits as its factorization.

9878815493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 62.

The square root of 9878815493 is about 99392.2305464567. The cubic root of 9878815493 is about 2145.6964930660.

The spelling of 9878815493 in words is "nine billion, eight hundred seventy-eight million, eight hundred fifteen thousand, four hundred ninety-three".