201090161 has 4 divisors (see below), whose sum is σ = 212919012. Its totient is φ = 189261312.

The previous prime is 201090157. The next prime is 201090163. The reversal of 201090161 is 161090102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173422561 + 27667600 = 13169^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 201090161 - 2² = 201090157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201090163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5914400 + ... + 5914433.

It is an arithmetic number, because the mean of its divisors is an integer number (53229753).

Almost surely, 2^201090161 is an apocalyptic number.

It is an amenable number.

201090161 is a deficient number, since it is larger than the sum of its proper divisors (11828851).

201090161 is a wasteful number, since it uses less digits than its factorization.

201090161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11828850.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 201090161 is about 14180.6262555643. The cubic root of 201090161 is about 585.8641729171.

The spelling of 201090161 in words is "two hundred one million, ninety thousand, one hundred sixty-one".