312121361 has 4 divisors (see below), whose sum is σ = 322189824. Its totient is φ = 302052900.

The previous prime is 312121331. The next prime is 312121363. The reversal of 312121361 is 163121213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312121361 - 2¹⁰ = 312120337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312121363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5034185 + ... + 5034246.

It is an arithmetic number, because the mean of its divisors is an integer number (80547456).

Almost surely, 2^312121361 is an apocalyptic number.

312121361 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

312121361 is a deficient number, since it is larger than the sum of its proper divisors (10068463).

312121361 is a wasteful number, since it uses less digits than its factorization.

312121361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068462.

The product of its digits is 216, while the sum is 20.

The square root of 312121361 is about 17666.9567554800. The cubic root of 312121361 is about 678.3302175475.

Adding to 312121361 its reverse (163121213), we get a palindrome (475242574).

The spelling of 312121361 in words is "three hundred twelve million, one hundred twenty-one thousand, three hundred sixty-one".