102450809 has 4 divisors (see below), whose sum is σ = 106905216. Its totient is φ = 97996404.

The previous prime is 102450767. The next prime is 102450853. The reversal of 102450809 is 908054201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102450809 - 2¹² = 102446713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102450889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2227169 + ... + 2227214.

It is an arithmetic number, because the mean of its divisors is an integer number (26726304).

Almost surely, 2^102450809 is an apocalyptic number.

It is an amenable number.

102450809 is a deficient number, since it is larger than the sum of its proper divisors (4454407).

102450809 is an equidigital number, since it uses as much as digits as its factorization.

102450809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454406.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 102450809 is about 10121.7987037878. The cubic root of 102450809 is about 467.9202036620.

The spelling of 102450809 in words is "one hundred two million, four hundred fifty thousand, eight hundred nine".