102209811 has 16 divisors (see below), whose sum is σ = 151476480. Its totient is φ = 60775520.

The previous prime is 102209801. The next prime is 102209881. The reversal of 102209811 is 118902201.

It is a cyclic number.

It is not a de Polignac number, because 102209811 - 2⁶ = 102209747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102209801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27471 + ... + 30968.

It is an arithmetic number, because the mean of its divisors is an integer number (9467280).

Almost surely, 2^102209811 is an apocalyptic number.

102209811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102209811 is a deficient number, since it is larger than the sum of its proper divisors (49266669).

102209811 is a wasteful number, since it uses less digits than its factorization.

102209811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58506.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 102209811 is about 10109.8867946184. The cubic root of 102209811 is about 467.5530148539.

The spelling of 102209811 in words is "one hundred two million, two hundred nine thousand, eight hundred eleven".