311121243521 has 8 divisors (see below), whose sum is σ = 340926991104. Its totient is φ = 281569162320.

The previous prime is 311121243457. The next prime is 311121243541. The reversal of 311121243521 is 125342121113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311121243521 - 2⁶ = 311121243457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (311121243541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63414026 + ... + 63418931.

It is an arithmetic number, because the mean of its divisors is an integer number (42615873888).

Almost surely, 2^311121243521 is an apocalyptic number.

It is an amenable number.

311121243521 is a deficient number, since it is larger than the sum of its proper divisors (29805747583).

311121243521 is a wasteful number, since it uses less digits than its factorization.

311121243521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126833191.

The product of its digits is 1440, while the sum is 26.

Adding to 311121243521 its reverse (125342121113), we get a palindrome (436463364634).

The spelling of 311121243521 in words is "three hundred eleven billion, one hundred twenty-one million, two hundred forty-three thousand, five hundred twenty-one".