205542261 has 12 divisors (see below), whose sum is σ = 299233792. Its totient is φ = 135948456.

The previous prime is 205542241. The next prime is 205542263. The reversal of 205542261 is 162245502.

It is not a de Polignac number, because 205542261 - 2⁵ = 205542229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205542263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88771 + ... + 91056.

Almost surely, 2^205542261 is an apocalyptic number.

It is an amenable number.

205542261 is a deficient number, since it is larger than the sum of its proper divisors (93691531).

205542261 is a wasteful number, since it uses less digits than its factorization.

205542261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179960 (or 179957 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 205542261 is about 14336.7451327001. The cubic root of 205542261 is about 590.1562939376.

Adding to 205542261 its reverse (162245502), we get a palindrome (367787763).

The spelling of 205542261 in words is "two hundred five million, five hundred forty-two thousand, two hundred sixty-one".