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987899999 is a prime number
BaseRepresentation
bin111010111000100…
…010100001011111
32112211220112000212
4322320202201133
54010400244444
6242010043035
733324003632
oct7270424137
92484815025
10987899999
11467709989
12236a1947b
13129891818
14952bbc19
155bae119e
hex3ae2285f

987899999 has 2 divisors, whose sum is σ = 987900000. Its totient is φ = 987899998.

The previous prime is 987899989. The next prime is 987900007. The reversal of 987899999 is 999998789.

It is a strong prime.

It is an emirp because it is prime and its reverse (999998789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987899999 - 28 = 987899743 is a prime.

987899999 is a modest number, since divided by 99999 gives 9878 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987899929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493949999 + 493950000.

It is an arithmetic number, because the mean of its divisors is an integer number (493950000).

Almost surely, 2987899999 is an apocalyptic number.

987899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

987899999 is an equidigital number, since it uses as much as digits as its factorization.

987899999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238085568, while the sum is 77.

The square root of 987899999 is about 31430.8765229352. The cubic root of 987899999 is about 995.9502883072.

It can be divided in two parts, 98 and 7899999, that added together give a palindrome (7900097).

The spelling of 987899999 in words is "nine hundred eighty-seven million, eight hundred ninety-nine thousand, nine hundred ninety-nine".