316785421 has 4 divisors (see below), whose sum is σ = 317025472. Its totient is φ = 316545372.

The previous prime is 316785419. The next prime is 316785433. The reversal of 316785421 is 124587613.

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: 124587613 = 5669 ⋅21977.

It is a cyclic number.

It is not a de Polignac number, because 316785421 - 2¹ = 316785419 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 (316785401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118035 + ... + 120688.

It is an arithmetic number, because the mean of its divisors is an integer number (79256368).

Almost surely, 2^316785421 is an apocalyptic number.

It is an amenable number.

316785421 is a deficient number, since it is larger than the sum of its proper divisors (240051).

316785421 is a wasteful number, since it uses less digits than its factorization.

316785421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240050.

The product of its digits is 40320, while the sum is 37.

The square root of 316785421 is about 17798.4668159929. The cubic root of 316785421 is about 681.6923109602.

It can be divided in two parts, 316785 and 421, that added together give a triangular number (317206 = T₇₉₆).

The spelling of 316785421 in words is "three hundred sixteen million, seven hundred eighty-five thousand, four hundred twenty-one".