99975709 has 2 divisors, whose sum is σ = 99975710. Its totient is φ = 99975708.

The previous prime is 99975683. The next prime is 99975761. The reversal of 99975709 is 90757999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58951684 + 41024025 = 7678^2 + 6405^2 .

It is a cyclic number.

It is not a de Polignac number, because 99975709 - 2¹⁹ = 99451421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99975709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99975769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49987854 + 49987855.

It is an arithmetic number, because the mean of its divisors is an integer number (49987855).

Almost surely, 2^99975709 is an apocalyptic number.

It is an amenable number.

99975709 is a deficient number, since it is larger than the sum of its proper divisors (1).

99975709 is an equidigital number, since it uses as much as digits as its factorization.

99975709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1607445, while the sum is 55.

The square root of 99975709 is about 9998.7853762345. The cubic root of 99975709 is about 464.1212973730.

The spelling of 99975709 in words is "ninety-nine million, nine hundred seventy-five thousand, seven hundred nine".