987378913 has 2 divisors, whose sum is σ = 987378914. Its totient is φ = 987378912.

The previous prime is 987378911. The next prime is 987378919. The reversal of 987378913 is 319873789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661106944 + 326271969 = 25712^2 + 18063^2 .

It is a cyclic number.

It is not a de Polignac number, because 987378913 - 2¹ = 987378911 is a prime.

Together with 987378911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (987378911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493689456 + 493689457.

It is an arithmetic number, because the mean of its divisors is an integer number (493689457).

Almost surely, 2^987378913 is an apocalyptic number.

It is an amenable number.

987378913 is a deficient number, since it is larger than the sum of its proper divisors (1).

987378913 is an equidigital number, since it uses as much as digits as its factorization.

987378913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 987378913 is about 31422.5860329795. The cubic root of 987378913 is about 995.7751467520.

The spelling of 987378913 in words is "nine hundred eighty-seven million, three hundred seventy-eight thousand, nine hundred thirteen".