312152321 has 4 divisors (see below), whose sum is σ = 336164052. Its totient is φ = 288140592.

The previous prime is 312152261. The next prime is 312152327. The reversal of 312152321 is 123251213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73017025 + 239135296 = 8545^2 + 15464^2 .

It is a cyclic number.

It is not a de Polignac number, because 312152321 - 2¹⁴ = 312135937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 312152293 and 312152302.

It is not an unprimeable number, because it can be changed into a prime (312152327) 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, 12005846 + ... + 12005871.

It is an arithmetic number, because the mean of its divisors is an integer number (84041013).

Almost surely, 2^312152321 is an apocalyptic number.

It is an amenable number.

312152321 is a deficient number, since it is larger than the sum of its proper divisors (24011731).

312152321 is a wasteful number, since it uses less digits than its factorization.

312152321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24011730.

The product of its digits is 360, while the sum is 20.

The square root of 312152321 is about 17667.8329457803. The cubic root of 312152321 is about 678.3526451582.

The spelling of 312152321 in words is "three hundred twelve million, one hundred fifty-two thousand, three hundred twenty-one".