202117431 has 4 divisors (see below), whose sum is σ = 269489912. Its totient is φ = 134744952.

The previous prime is 202117429. The next prime is 202117439. The reversal of 202117431 is 134711202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 202117431 - 2¹ = 202117429 is a prime.

It is a super-2 number, since 2×202117431² = 81702911828079522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202117398 and 202117407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202117439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33686236 + ... + 33686241.

It is an arithmetic number, because the mean of its divisors is an integer number (67372478).

Almost surely, 2^202117431 is an apocalyptic number.

202117431 is a deficient number, since it is larger than the sum of its proper divisors (67372481).

202117431 is an equidigital number, since it uses as much as digits as its factorization.

202117431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67372480.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 202117431 is about 14216.8010114793. The cubic root of 202117431 is about 586.8601088517.

Adding to 202117431 its reverse (134711202), we get a palindrome (336828633).

The spelling of 202117431 in words is "two hundred two million, one hundred seventeen thousand, four hundred thirty-one".