1201230311 has 4 divisors (see below), whose sum is σ = 1201550472. Its totient is φ = 1200910152.

The previous prime is 1201230301. The next prime is 1201230379. The reversal of 1201230311 is 1130321021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201230311 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 (1201230301) 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, 154385 + ... + 161978.

It is an arithmetic number, because the mean of its divisors is an integer number (300387618).

Almost surely, 2^1201230311 is an apocalyptic number.

1201230311 is a deficient number, since it is larger than the sum of its proper divisors (320161).

1201230311 is an equidigital number, since it uses as much as digits as its factorization.

1201230311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320160.

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

The square root of 1201230311 is about 34658.7696117447. The cubic root of 1201230311 is about 1063.0216119529.

Adding to 1201230311 its reverse (1130321021), we get a palindrome (2331551332).

The spelling of 1201230311 in words is "one billion, two hundred one million, two hundred thirty thousand, three hundred eleven".