312120143 has 4 divisors (see below), whose sum is σ = 325690608. Its totient is φ = 298549680.

The previous prime is 312120139. The next prime is 312120169. The reversal of 312120143 is 341021213.

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

It is a cyclic number.

It is not a de Polignac number, because 312120143 - 2² = 312120139 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 (312120173) 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, 6785198 + ... + 6785243.

It is an arithmetic number, because the mean of its divisors is an integer number (81422652).

Almost surely, 2^312120143 is an apocalyptic number.

312120143 is a deficient number, since it is larger than the sum of its proper divisors (13570465).

312120143 is a wasteful number, since it uses less digits than its factorization.

312120143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13570464.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 312120143 is about 17666.9222843143. The cubic root of 312120143 is about 678.3293351906.

Adding to 312120143 its reverse (341021213), we get a palindrome (653141356).

The spelling of 312120143 in words is "three hundred twelve million, one hundred twenty thousand, one hundred forty-three".