102209812 has 6 divisors (see below), whose sum is σ = 178867178. Its totient is φ = 51104904.

The previous prime is 102209801. The next prime is 102209881. The reversal of 102209812 is 218902201.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 22714756 = 8916^2 + 4766^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776223 + ... + 12776230.

Almost surely, 2^102209812 is an apocalyptic number.

It is an amenable number.

102209812 is a deficient number, since it is larger than the sum of its proper divisors (76657366).

102209812 is a wasteful number, since it uses less digits than its factorization.

102209812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25552457 (or 25552455 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 102209812 is about 10109.8868440750. The cubic root of 102209812 is about 467.5530163788.

The spelling of 102209812 in words is "one hundred two million, two hundred nine thousand, eight hundred twelve".