201800061 has 24 divisors (see below), whose sum is σ = 296791040. Its totient is φ = 132109056.

The previous prime is 201800057. The next prime is 201800063. The reversal of 201800061 is 160008102.

It is not a de Polignac number, because 201800061 - 2² = 201800057 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 (201800063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120516 + ... + 122178.

Almost surely, 2^201800061 is an apocalyptic number.

It is an amenable number.

201800061 is a deficient number, since it is larger than the sum of its proper divisors (94990979).

201800061 is a wasteful number, since it uses less digits than its factorization.

201800061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 201800061 is about 14205.6348326993. The cubic root of 201800061 is about 586.5527803138.

Adding to 201800061 its reverse (160008102), we get a palindrome (361808163).

It can be divided in two parts, 20 and 1800061, that added together give a palindrome (1800081).

The spelling of 201800061 in words is "two hundred one million, eight hundred thousand, sixty-one".