201001011 has 4 divisors (see below), whose sum is σ = 268001352. Its totient is φ = 134000672.

The previous prime is 201001007. The next prime is 201001037. The reversal of 201001011 is 110100102.

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

It is a cyclic number.

It is not a de Polignac number, because 201001011 - 2² = 201001007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201501011) 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, 33500166 + ... + 33500171.

It is an arithmetic number, because the mean of its divisors is an integer number (67000338).

Almost surely, 2^201001011 is an apocalyptic number.

201001011 is a deficient number, since it is larger than the sum of its proper divisors (67000341).

201001011 is an equidigital number, since it uses as much as digits as its factorization.

201001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67000340.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 201001011 is about 14177.4825339339. The cubic root of 201001011 is about 585.7775823864. Note that the first 3 decimals are identical.

Adding to 201001011 its reverse (110100102), we get a palindrome (311101113).

Subtracting from 201001011 its reverse (110100102), we obtain a palindrome (90900909).

It can be divided in two parts, 20100101 and 1, that added together give a palindrome (20100102).

The spelling of 201001011 in words is "two hundred one million, one thousand, eleven".