102299809 has 2 divisors, whose sum is σ = 102299810. Its totient is φ = 102299808.

The previous prime is 102299779. The next prime is 102299839. The reversal of 102299809 is 908992201.

It is a balanced prime because it is at equal distance from previous prime (102299779) and next prime (102299839).

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 1096209 = 10060^2 + 1047^2 .

It is a cyclic number.

It is not a de Polignac number, because 102299809 - 2¹⁵ = 102267041 is a prime.

It is not a weakly prime, because it can be changed into another prime (102299839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51149904 + 51149905.

It is an arithmetic number, because the mean of its divisors is an integer number (51149905).

Almost surely, 2^102299809 is an apocalyptic number.

It is an amenable number.

102299809 is a deficient number, since it is larger than the sum of its proper divisors (1).

102299809 is an equidigital number, since it uses as much as digits as its factorization.

102299809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 102299809 is about 10114.3368047539. The cubic root of 102299809 is about 467.6902048536.

The spelling of 102299809 in words is "one hundred two million, two hundred ninety-nine thousand, eight hundred nine".