312111973 has 2 divisors, whose sum is σ = 312111974. Its totient is φ = 312111972.

The previous prime is 312111971. The next prime is 312111977. The reversal of 312111973 is 379111213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303003649 + 9108324 = 17407^2 + 3018^2 .

It is a cyclic number.

It is not a de Polignac number, because 312111973 - 2¹ = 312111971 is a prime.

Together with 312111971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312111971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156055986 + 156055987.

It is an arithmetic number, because the mean of its divisors is an integer number (156055987).

Almost surely, 2^312111973 is an apocalyptic number.

It is an amenable number.

312111973 is a deficient number, since it is larger than the sum of its proper divisors (1).

312111973 is an equidigital number, since it uses as much as digits as its factorization.

312111973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 28.

The square root of 312111973 is about 17666.6910597316. The cubic root of 312111973 is about 678.3234165306.

The spelling of 312111973 in words is "three hundred twelve million, one hundred eleven thousand, nine hundred seventy-three".