312748249 has 4 divisors (see below), whose sum is σ = 341179920. Its totient is φ = 284316580.

The previous prime is 312748237. The next prime is 312748253. The reversal of 312748249 is 942847213.

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.

It is a cyclic number.

It is not a de Polignac number, because 312748249 - 2¹⁷ = 312617177 is a prime.

It is a super-2 number, since 2×312748249² = 195622934505132002, which contains 22 as substring.

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 (312748049) 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, 14215819 + ... + 14215840.

It is an arithmetic number, because the mean of its divisors is an integer number (85294980).

Almost surely, 2^312748249 is an apocalyptic number.

It is an amenable number.

312748249 is a deficient number, since it is larger than the sum of its proper divisors (28431671).

312748249 is a wasteful number, since it uses less digits than its factorization.

312748249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28431670.

The product of its digits is 96768, while the sum is 40.

The square root of 312748249 is about 17684.6896777976. The cubic root of 312748249 is about 678.7840503094.

The spelling of 312748249 in words is "three hundred twelve million, seven hundred forty-eight thousand, two hundred forty-nine".