205551331 has 8 divisors (see below), whose sum is σ = 210080304. Its totient is φ = 201046560.

The previous prime is 205551293. The next prime is 205551337. The reversal of 205551331 is 133155502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205551331 - 2⁹ = 205550819 is a prime.

It is a super-2 number, since 2×205551331² = 84502699351743122, 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 = 205551296 and 205551305.

It is not an unprimeable number, because it can be changed into a prime (205551337) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11685 + ... + 23401.

It is an arithmetic number, because the mean of its divisors is an integer number (26260038).

Almost surely, 2^205551331 is an apocalyptic number.

205551331 is a deficient number, since it is larger than the sum of its proper divisors (4528973).

205551331 is a wasteful number, since it uses less digits than its factorization.

205551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12101.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 205551331 is about 14337.0614492650. The cubic root of 205551331 is about 590.1649744539.

The spelling of 205551331 in words is "two hundred five million, five hundred fifty-one thousand, three hundred thirty-one".