1201323111 has 4 divisors (see below), whose sum is σ = 1601764152. Its totient is φ = 800882072.

The previous prime is 1201323107. The next prime is 1201323119. The reversal of 1201323111 is 1113231021.

It is a happy number.

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 1201323111 - 2² = 1201323107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201323119) 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, 200220516 + ... + 200220521.

It is an arithmetic number, because the mean of its divisors is an integer number (400441038).

Almost surely, 2^1201323111 is an apocalyptic number.

1201323111 is a deficient number, since it is larger than the sum of its proper divisors (400441041).

1201323111 is an equidigital number, since it uses as much as digits as its factorization.

1201323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400441040.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1201323111 is about 34660.1083523984. The cubic root of 1201323111 is about 1063.0489855172.

Adding to 1201323111 its reverse (1113231021), we get a palindrome (2314554132).

It can be divided in two parts, 120 and 1323111, that added together give a palindrome (1323231).

The spelling of 1201323111 in words is "one billion, two hundred one million, three hundred twenty-three thousand, one hundred eleven".