312642305 has 4 divisors (see below), whose sum is σ = 375170772. Its totient is φ = 250113840.

The previous prime is 312642247. The next prime is 312642307. The reversal of 312642305 is 503246213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503246213 = 37 ⋅13601249.

It can be written as a sum of positive squares in 2 ways, for example, as 92179201 + 220463104 = 9601^2 + 14848^2 .

It is not a de Polignac number, because 312642305 - 2⁸ = 312642049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312642307) 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, 31264226 + ... + 31264235.

It is an arithmetic number, because the mean of its divisors is an integer number (93792693).

Almost surely, 2^312642305 is an apocalyptic number.

It is an amenable number.

312642305 is a deficient number, since it is larger than the sum of its proper divisors (62528467).

312642305 is an equidigital number, since it uses as much as digits as its factorization.

312642305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62528466.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 312642305 is about 17681.6940647665. The cubic root of 312642305 is about 678.7073952368.

Adding to 312642305 its reverse (503246213), we get a palindrome (815888518).

The spelling of 312642305 in words is "three hundred twelve million, six hundred forty-two thousand, three hundred five".