209933154431 has 16 divisors (see below), whose sum is σ = 281868292608. Its totient is φ = 151000869600.

The previous prime is 209933154349. The next prime is 209933154437. The reversal of 209933154431 is 134451339902.

It is not a de Polignac number, because 209933154431 - 2²⁶ = 209866045567 is a prime.

It is a super-2 number, since 2×209933154431² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209933154437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104860715 + ... + 104862716.

It is an arithmetic number, because the mean of its divisors is an integer number (17616768288).

Almost surely, 2^209933154431 is an apocalyptic number.

209933154431 is a deficient number, since it is larger than the sum of its proper divisors (71935138177).

209933154431 is a wasteful number, since it uses less digits than its factorization.

209933154431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209723462.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 209933154431 in words is "two hundred nine billion, nine hundred thirty-three million, one hundred fifty-four thousand, four hundred thirty-one".