312120133 has 4 divisors (see below), whose sum is σ = 336129388. Its totient is φ = 288110880.

The previous prime is 312120131. The next prime is 312120139. The reversal of 312120133 is 331021213.

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 51523684 + 260596449 = 7178^2 + 16143^2 .

It is a cyclic number.

It is not a de Polignac number, because 312120133 - 2¹ = 312120131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312120131) by changing a digit.

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, 12004608 + ... + 12004633.

It is an arithmetic number, because the mean of its divisors is an integer number (84032347).

Almost surely, 2^312120133 is an apocalyptic number.

It is an amenable number.

312120133 is a deficient number, since it is larger than the sum of its proper divisors (24009255).

312120133 is a wasteful number, since it uses less digits than its factorization.

312120133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24009254.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 312120133 is about 17666.9220012995. The cubic root of 312120133 is about 678.3293279463.

Adding to 312120133 its reverse (331021213), we get a palindrome (643141346).

The spelling of 312120133 in words is "three hundred twelve million, one hundred twenty thousand, one hundred thirty-three".