102449909 has 2 divisors, whose sum is σ = 102449910. Its totient is φ = 102449908.

The previous prime is 102449903. The next prime is 102449933. The reversal of 102449909 is 909944201.

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., 58599025 + 43850884 = 7655^2 + 6622^2 .

It is a cyclic number.

It is not a de Polignac number, because 102449909 - 2²⁴ = 85672693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102449903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51224954 + 51224955.

It is an arithmetic number, because the mean of its divisors is an integer number (51224955).

Almost surely, 2^102449909 is an apocalyptic number.

It is an amenable number.

102449909 is a deficient number, since it is larger than the sum of its proper divisors (1).

102449909 is an equidigital number, since it uses as much as digits as its factorization.

102449909 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 38.

The square root of 102449909 is about 10121.7542451889. The cubic root of 102449909 is about 467.9188334779.

The spelling of 102449909 in words is "one hundred two million, four hundred forty-nine thousand, nine hundred nine".