1201005111 has 4 divisors (see below), whose sum is σ = 1601340152. Its totient is φ = 800670072.

The previous prime is 1201005077. The next prime is 1201005133. The reversal of 1201005111 is 1115001021.

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

It is not a de Polignac number, because 1201005111 - 2¹³ = 1200996919 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 (1201005151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200167516 + ... + 200167521.

It is an arithmetic number, because the mean of its divisors is an integer number (400335038).

Almost surely, 2^1201005111 is an apocalyptic number.

1201005111 is a deficient number, since it is larger than the sum of its proper divisors (400335041).

1201005111 is an equidigital number, since it uses as much as digits as its factorization.

1201005111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400335040.

The product of its (nonzero) digits is 10, while the sum is 12.

The square root of 1201005111 is about 34655.5206424604. The cubic root of 1201005111 is about 1062.9551780014.

Adding to 1201005111 its reverse (1115001021), we get a palindrome (2316006132).

The spelling of 1201005111 in words is "one billion, two hundred one million, five thousand, one hundred eleven".