201685545 has 20 divisors (see below), whose sum is σ = 361540740. Its totient is φ = 107565408.

The previous prime is 201685529. The next prime is 201685553. The reversal of 201685545 is 545586102.

201685545 is a `hidden beast` number, since 20 + 16 + 85 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 91183401 + 110502144 = 9549^2 + 10512^2 .

It is not a de Polignac number, because 201685545 - 2⁴ = 201685529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 248590 + ... + 249399.

It is an arithmetic number, because the mean of its divisors is an integer number (18077037).

Almost surely, 2^201685545 is an apocalyptic number.

It is an amenable number.

201685545 is a deficient number, since it is larger than the sum of its proper divisors (159855195).

201685545 is an equidigital number, since it uses as much as digits as its factorization.

201685545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498006 (or 497997 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 201685545 is about 14201.6036066354. The cubic root of 201685545 is about 586.4418084480.

The spelling of 201685545 in words is "two hundred one million, six hundred eighty-five thousand, five hundred forty-five".