87912709 has 2 divisors, whose sum is σ = 87912710. Its totient is φ = 87912708.

The previous prime is 87912707. The next prime is 87912731. The reversal of 87912709 is 90721978.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 4190209 = 9150^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 87912709 - 2¹ = 87912707 is a prime.

Together with 87912707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87912707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43956354 + 43956355.

It is an arithmetic number, because the mean of its divisors is an integer number (43956355).

Almost surely, 2^87912709 is an apocalyptic number.

It is an amenable number.

87912709 is a deficient number, since it is larger than the sum of its proper divisors (1).

87912709 is an equidigital number, since it uses as much as digits as its factorization.

87912709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 87912709 is about 9376.1777393563. The cubic root of 87912709 is about 444.6488986659.

The spelling of 87912709 in words is "eighty-seven million, nine hundred twelve thousand, seven hundred nine".