312497 has 4 divisors (see below), whose sum is σ = 314916. Its totient is φ = 310080.

The previous prime is 312469. The next prime is 312509. The reversal of 312497 is 794213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185761 + 126736 = 431^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 312497 - 2⁸ = 312241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312407) 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, 1004 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (78729).

312497 is a Friedman number, since it can be written as 4*((9+1)/2)^7-3, using all its digits and the basic arithmetic operations.

2³¹²⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

312497 is a deficient number, since it is larger than the sum of its proper divisors (2419).

312497 is a wasteful number, since it uses less digits than its factorization.

312497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418.

The product of its digits is 1512, while the sum is 26.

The square root of 312497 is about 559.0143110869. The cubic root of 312497 is about 67.8602232608.

The spelling of 312497 in words is "three hundred twelve thousand, four hundred ninety-seven".