201012091 has 16 divisors (see below), whose sum is σ = 242196480. Its totient is φ = 163182240.

The previous prime is 201012073. The next prime is 201012101. The reversal of 201012091 is 190210102.

It is a cyclic number.

It is not a de Polignac number, because 201012091 - 2⁵ = 201012059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201012391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345 + ... + 20053.

It is an arithmetic number, because the mean of its divisors is an integer number (15137280).

Almost surely, 2^201012091 is an apocalyptic number.

201012091 is a deficient number, since it is larger than the sum of its proper divisors (41184389).

201012091 is a wasteful number, since it uses less digits than its factorization.

201012091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19794.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 201012091 is about 14177.8732890374. The cubic root of 201012091 is about 585.7883456761.

Adding to 201012091 its reverse (190210102), we get a palindrome (391222193).

The spelling of 201012091 in words is "two hundred one million, twelve thousand, ninety-one".