316666421 has 4 divisors (see below), whose sum is σ = 317328000. Its totient is φ = 316004844.

The previous prime is 316666417. The next prime is 316666439. The reversal of 316666421 is 124666613.

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 an emirpimes, since its reverse is a distinct semiprime: 124666613 = 193 ⋅645941.

It is a cyclic number.

It is not a de Polignac number, because 316666421 - 2² = 316666417 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 (316666451) 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, 330071 + ... + 331028.

It is an arithmetic number, because the mean of its divisors is an integer number (79332000).

Almost surely, 2^316666421 is an apocalyptic number.

It is an amenable number.

316666421 is a deficient number, since it is larger than the sum of its proper divisors (661579).

316666421 is an equidigital number, since it uses as much as digits as its factorization.

316666421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661578.

The product of its digits is 31104, while the sum is 35.

The square root of 316666421 is about 17795.1235174134. The cubic root of 316666421 is about 681.6069413488.

The spelling of 316666421 in words is "three hundred sixteen million, six hundred sixty-six thousand, four hundred twenty-one".