1201320311 has 4 divisors (see below), whose sum is σ = 1201441800. Its totient is φ = 1201198824.

The previous prime is 1201320301. The next prime is 1201320319. The reversal of 1201320311 is 1130231021.

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 1201320311 - 2⁶ = 1201320247 is a prime.

It is a super-2 number, since 2×1201320311² = 2886340979242273442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201320319) 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, 44456 + ... + 66173.

It is an arithmetic number, because the mean of its divisors is an integer number (300360450).

Almost surely, 2^1201320311 is an apocalyptic number.

1201320311 is a deficient number, since it is larger than the sum of its proper divisors (121489).

1201320311 is a wasteful number, since it uses less digits than its factorization.

1201320311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121488.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1201320311 is about 34660.0679601180. The cubic root of 1201320311 is about 1063.0481596113.

Adding to 1201320311 its reverse (1130231021), we get a palindrome (2331551332).

The spelling of 1201320311 in words is "one billion, two hundred one million, three hundred twenty thousand, three hundred eleven".