312219997 has 4 divisors (see below), whose sum is σ = 312264160. Its totient is φ = 312175836.

The previous prime is 312219991. The next prime is 312220001. The reversal of 312219997 is 799912213.

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 312219997 - 2¹¹ = 312217949 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 (312219991) 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, 8823 + ... + 26500.

It is an arithmetic number, because the mean of its divisors is an integer number (78066040).

Almost surely, 2^312219997 is an apocalyptic number.

It is an amenable number.

312219997 is a deficient number, since it is larger than the sum of its proper divisors (44163).

312219997 is an equidigital number, since it uses as much as digits as its factorization.

312219997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44162.

The product of its digits is 61236, while the sum is 43.

The square root of 312219997 is about 17669.7480740389. The cubic root of 312219997 is about 678.4016648977.

The spelling of 312219997 in words is "three hundred twelve million, two hundred nineteen thousand, nine hundred ninety-seven".