99687409 has 2 divisors, whose sum is σ = 99687410. Its totient is φ = 99687408.

The previous prime is 99687391. The next prime is 99687421. The reversal of 99687409 is 90478699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99201600 + 485809 = 9960^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 99687409 - 2⁹ = 99686897 is a prime.

It is not a weakly prime, because it can be changed into another prime (99687449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49843704 + 49843705.

It is an arithmetic number, because the mean of its divisors is an integer number (49843705).

Almost surely, 2^99687409 is an apocalyptic number.

It is an amenable number.

99687409 is a deficient number, since it is larger than the sum of its proper divisors (1).

99687409 is an equidigital number, since it uses as much as digits as its factorization.

99687409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 99687409 is about 9984.3582167308. The cubic root of 99687409 is about 463.6747389146.

The spelling of 99687409 in words is "ninety-nine million, six hundred eighty-seven thousand, four hundred nine".