209850129 has 32 divisors (see below), whose sum is σ = 322227200. Its totient is φ = 134835840.

The previous prime is 209850127. The next prime is 209850131. The reversal of 209850129 is 921058902.

It is an interprime number because it is at equal distance from previous prime (209850127) and next prime (209850131).

It is not a de Polignac number, because 209850129 - 2¹ = 209850127 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209850093 and 209850102.

It is not an unprimeable number, because it can be changed into a prime (209850127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342027 + ... + 342639.

It is an arithmetic number, because the mean of its divisors is an integer number (10069600).

Almost surely, 2^209850129 is an apocalyptic number.

It is an amenable number.

209850129 is a deficient number, since it is larger than the sum of its proper divisors (112377071).

209850129 is a wasteful number, since it uses less digits than its factorization.

209850129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 209850129 is about 14486.2047824818. The cubic root of 209850129 is about 594.2507613828.

The spelling of 209850129 in words is "two hundred nine million, eight hundred fifty thousand, one hundred twenty-nine".