209996155 has 16 divisors (see below), whose sum is σ = 267960960. Its totient is φ = 157437952.

The previous prime is 209996147. The next prime is 209996161. The reversal of 209996155 is 551699902.

It is not a de Polignac number, because 209996155 - 2³ = 209996147 is a prime.

It is a super-2 number, since 2×209996155² = 88196770229568050, which contains 22 as substring.

It is an unprimeable number.

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, 15147 + ... + 25483.

It is an arithmetic number, because the mean of its divisors is an integer number (16747560).

Almost surely, 2^209996155 is an apocalyptic number.

209996155 is a deficient number, since it is larger than the sum of its proper divisors (57964805).

209996155 is a wasteful number, since it uses less digits than its factorization.

209996155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10598.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 209996155 is about 14491.2440804784. The cubic root of 209996155 is about 594.3885675748.

The spelling of 209996155 in words is "two hundred nine million, nine hundred ninety-six thousand, one hundred fifty-five".