99931709 has 8 divisors (see below), whose sum is σ = 106172760. Its totient is φ = 93877056.

The previous prime is 99931703. The next prime is 99931717. The reversal of 99931709 is 90713999.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19829209 + 80102500 = 4453^2 + 8950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99931709 - 2²⁰ = 98883133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99931703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45494 + ... + 47639.

It is an arithmetic number, because the mean of its divisors is an integer number (13271595).

Almost surely, 2^99931709 is an apocalyptic number.

It is an amenable number.

99931709 is a deficient number, since it is larger than the sum of its proper divisors (6241051).

99931709 is a wasteful number, since it uses less digits than its factorization.

99931709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93199.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 99931709 is about 9996.5848668433. The cubic root of 99931709 is about 464.0531997191.

The spelling of 99931709 in words is "ninety-nine million, nine hundred thirty-one thousand, seven hundred nine".