209154422913 has 16 divisors (see below), whose sum is σ = 282930048960. Its totient is φ = 137410746624.

The previous prime is 209154422849. The next prime is 209154422929. The reversal of 209154422913 is 319224451902.

It is not a de Polignac number, because 209154422913 - 2⁶ = 209154422849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209154422413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139003 + ... + 661536.

It is an arithmetic number, because the mean of its divisors is an integer number (17683128060).

Almost surely, 2^209154422913 is an apocalyptic number.

It is an amenable number.

209154422913 is a deficient number, since it is larger than the sum of its proper divisors (73775626047).

209154422913 is a wasteful number, since it uses less digits than its factorization.

209154422913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801808.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 209154422913 in words is "two hundred nine billion, one hundred fifty-four million, four hundred twenty-two thousand, nine hundred thirteen".