312778273 has 4 divisors (see below), whose sum is σ = 313967808. Its totient is φ = 311588740.

The previous prime is 312778241. The next prime is 312778283. The reversal of 312778273 is 372877213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 372877213 = 313 ⋅1191301.

It is a cyclic number.

It is not a de Polignac number, because 312778273 - 2⁵ = 312778241 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312778283) 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, 594373 + ... + 594898.

It is an arithmetic number, because the mean of its divisors is an integer number (78491952).

Almost surely, 2^312778273 is an apocalyptic number.

It is an amenable number.

312778273 is a deficient number, since it is larger than the sum of its proper divisors (1189535).

312778273 is a wasteful number, since it uses less digits than its factorization.

312778273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189534.

The product of its digits is 98784, while the sum is 40.

The square root of 312778273 is about 17685.5385272827. The cubic root of 312778273 is about 678.8057708256.

The spelling of 312778273 in words is "three hundred twelve million, seven hundred seventy-eight thousand, two hundred seventy-three".