312143121 has 12 divisors (see below), whose sum is σ = 460467072. Its totient is φ = 203667576.

The previous prime is 312143119. The next prime is 312143147. The reversal of 312143121 is 121341213.

It is not a de Polignac number, because 312143121 - 2¹ = 312143119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312143094 and 312143103.

It is not an unprimeable number, because it can be changed into a prime (312143101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368541 + ... + 369386.

It is an arithmetic number, because the mean of its divisors is an integer number (38372256).

Almost surely, 2^312143121 is an apocalyptic number.

It is an amenable number.

312143121 is a deficient number, since it is larger than the sum of its proper divisors (148323951).

312143121 is a wasteful number, since it uses less digits than its factorization.

312143121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737980 (or 737977 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 312143121 is about 17667.5725836913. The cubic root of 312143121 is about 678.3459807776.

Adding to 312143121 its reverse (121341213), we get a palindrome (433484334).

The spelling of 312143121 in words is "three hundred twelve million, one hundred forty-three thousand, one hundred twenty-one".