312847921 has 4 divisors (see below), whose sum is σ = 313060644. Its totient is φ = 312635200.

The previous prime is 312847903. The next prime is 312847943. The reversal of 312847921 is 129748213.

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 82901025 + 229946896 = 9105^2 + 15164^2 .

It is a cyclic number.

It is not a de Polignac number, because 312847921 - 2¹⁹ = 312323633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312847961) 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, 104140 + ... + 107101.

It is an arithmetic number, because the mean of its divisors is an integer number (78265161).

Almost surely, 2^312847921 is an apocalyptic number.

It is an amenable number.

312847921 is a deficient number, since it is larger than the sum of its proper divisors (212723).

312847921 is a wasteful number, since it uses less digits than its factorization.

312847921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212722.

The product of its digits is 24192, while the sum is 37.

The square root of 312847921 is about 17687.5074840974. The cubic root of 312847921 is about 678.8561515155.

The spelling of 312847921 in words is "three hundred twelve million, eight hundred forty-seven thousand, nine hundred twenty-one".