311213121 has 8 divisors (see below), whose sum is σ = 415910880. Its totient is φ = 206995392.

The previous prime is 311213117. The next prime is 311213131. The reversal of 311213121 is 121312113.

It is a happy number.

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

It is not a de Polignac number, because 311213121 - 2² = 311213117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311213121.

It is not an unprimeable number, because it can be changed into a prime (311213131) 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, 118491 + ... + 121088.

It is an arithmetic number, because the mean of its divisors is an integer number (51988860).

Almost surely, 2^311213121 is an apocalyptic number.

It is an amenable number.

311213121 is a deficient number, since it is larger than the sum of its proper divisors (104697759).

311213121 is a wasteful number, since it uses less digits than its factorization.

311213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240015.

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

The square root of 311213121 is about 17641.2335453052. The cubic root of 311213121 is about 677.6716220309.

Adding to 311213121 its reverse (121312113), we get a palindrome (432525234).

The spelling of 311213121 in words is "three hundred eleven million, two hundred thirteen thousand, one hundred twenty-one".