205422031 has 4 divisors (see below), whose sum is σ = 206082864. Its totient is φ = 204761200.

The previous prime is 205422029. The next prime is 205422079. The reversal of 205422031 is 130224502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130224502 = 2 ⋅65112251.

It is a cyclic number.

It is not a de Polignac number, because 205422031 - 2¹ = 205422029 is a prime.

It is a super-3 number, since 3×205422031³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205422001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329950 + ... + 330571.

It is an arithmetic number, because the mean of its divisors is an integer number (51520716).

Almost surely, 2^205422031 is an apocalyptic number.

205422031 is a deficient number, since it is larger than the sum of its proper divisors (660833).

205422031 is an equidigital number, since it uses as much as digits as its factorization.

205422031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660832.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 205422031 is about 14332.5514476663. The cubic root of 205422031 is about 590.0412027148.

Adding to 205422031 its reverse (130224502), we get a palindrome (335646533).

The spelling of 205422031 in words is "two hundred five million, four hundred twenty-two thousand, thirty-one".