312120145 has 4 divisors (see below), whose sum is σ = 374544180. Its totient is φ = 249696112.

The previous prime is 312120139. The next prime is 312120169. The reversal of 312120145 is 541021213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541021213 = 251 ⋅2155463.

It can be written as a sum of positive squares in 2 ways, for example, as 65221776 + 246898369 = 8076^2 + 15713^2 .

It is a cyclic number.

It is not a de Polignac number, because 312120145 - 2¹⁹ = 311595857 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31212010 + ... + 31212019.

It is an arithmetic number, because the mean of its divisors is an integer number (93636045).

Almost surely, 2^312120145 is an apocalyptic number.

It is an amenable number.

312120145 is a deficient number, since it is larger than the sum of its proper divisors (62424035).

312120145 is an equidigital number, since it uses as much as digits as its factorization.

312120145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62424034.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 312120145 is about 17666.9223409172. The cubic root of 312120145 is about 678.3293366394.

Adding to 312120145 its reverse (541021213), we get a palindrome (853141358).

The spelling of 312120145 in words is "three hundred twelve million, one hundred twenty thousand, one hundred forty-five".