102051209 has 8 divisors (see below), whose sum is σ = 110360712. Its totient is φ = 93807360.

The previous prime is 102051199. The next prime is 102051233. The reversal of 102051209 is 902150201.

It can be written as a sum of positive squares in 4 ways, for example, as 41209 + 102010000 = 203^2 + 10100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102051209 - 2⁸ = 102050953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102054209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13154 + ... + 19419.

It is an arithmetic number, because the mean of its divisors is an integer number (13795089).

Almost surely, 2^102051209 is an apocalyptic number.

It is an amenable number.

102051209 is a deficient number, since it is larger than the sum of its proper divisors (8309503).

102051209 is a wasteful number, since it uses less digits than its factorization.

102051209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32827.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 102051209 is about 10102.0398435168. The cubic root of 102051209 is about 467.3110510225.

The spelling of 102051209 in words is "one hundred two million, fifty-one thousand, two hundred nine".