312143449 has 2 divisors, whose sum is σ = 312143450. Its totient is φ = 312143448.

The previous prime is 312143423. The next prime is 312143479. The reversal of 312143449 is 944341213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309056400 + 3087049 = 17580^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 312143449 - 2⁵ = 312143417 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312143449.

It is not a weakly prime, because it can be changed into another prime (312143479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156071724 + 156071725.

It is an arithmetic number, because the mean of its divisors is an integer number (156071725).

Almost surely, 2^312143449 is an apocalyptic number.

It is an amenable number.

312143449 is a deficient number, since it is larger than the sum of its proper divisors (1).

312143449 is an equidigital number, since it uses as much as digits as its factorization.

312143449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 312143449 is about 17667.5818662317. The cubic root of 312143449 is about 678.3462183795.

The spelling of 312143449 in words is "three hundred twelve million, one hundred forty-three thousand, four hundred forty-nine".