312121241 has 4 divisors (see below), whose sum is σ = 330481332. Its totient is φ = 293761152.

The previous prime is 312121217. The next prime is 312121273. The reversal of 312121241 is 142121213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142121213 = 13 ⋅10932401.

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 218418841 = 9680^2 + 14779^2 .

It is a cyclic number.

It is not a de Polignac number, because 312121241 - 2¹⁰ = 312120217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 18360073 = 312121241 / (3 + 1 + 2 + 1 + 2 + 1 + 2 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312121291) 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, 9180020 + ... + 9180053.

It is an arithmetic number, because the mean of its divisors is an integer number (82620333).

Almost surely, 2^312121241 is an apocalyptic number.

It is an amenable number.

312121241 is a deficient number, since it is larger than the sum of its proper divisors (18360091).

312121241 is a wasteful number, since it uses less digits than its factorization.

312121241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360090.

The product of its digits is 96, while the sum is 17.

The square root of 312121241 is about 17666.9533593090. The cubic root of 312121241 is about 678.3301306158.

Adding to 312121241 its reverse (142121213), we get a palindrome (454242454).

The spelling of 312121241 in words is "three hundred twelve million, one hundred twenty-one thousand, two hundred forty-one".