312213197 has 4 divisors (see below), whose sum is σ = 312250080. Its totient is φ = 312176316.

The previous prime is 312213173. The next prime is 312213203. The reversal of 312213197 is 791312213.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312213197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312263197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 25022.

It is an arithmetic number, because the mean of its divisors is an integer number (78062520).

Almost surely, 2^312213197 is an apocalyptic number.

It is an amenable number.

312213197 is a deficient number, since it is larger than the sum of its proper divisors (36883).

312213197 is a wasteful number, since it uses less digits than its factorization.

312213197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36882.

The product of its digits is 2268, while the sum is 29.

The square root of 312213197 is about 17669.5556537226. Note that the first 3 decimals coincide. The cubic root of 312213197 is about 678.3967397756.

The spelling of 312213197 in words is "three hundred twelve million, two hundred thirteen thousand, one hundred ninety-seven".