102426809 has 4 divisors (see below), whose sum is σ = 102453120. Its totient is φ = 102400500.

The previous prime is 102426803. The next prime is 102426829. The reversal of 102426809 is 908624201.

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 a de Polignac number, because none of the positive numbers 2^k-102426809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102426803) 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, 6029 + ... + 15530.

It is an arithmetic number, because the mean of its divisors is an integer number (25613280).

Almost surely, 2^102426809 is an apocalyptic number.

It is an amenable number.

102426809 is a deficient number, since it is larger than the sum of its proper divisors (26311).

102426809 is an equidigital number, since it uses as much as digits as its factorization.

102426809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26310.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 102426809 is about 10120.6130743152. The cubic root of 102426809 is about 467.8836626721.

The spelling of 102426809 in words is "one hundred two million, four hundred twenty-six thousand, eight hundred nine".