315821242 has 32 divisors (see below), whose sum is σ = 535062528. Its totient is φ = 138510000.

The previous prime is 315821227. The next prime is 315821251. The reversal of 315821242 is 242128513.

It is a Cunningham number, because it is equal to 681³+1.

It is a self number, because there is not a number n which added to its sum of digits gives 315821242.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389017 + ... + 389827.

It is an arithmetic number, because the mean of its divisors is an integer number (16720704).

Almost surely, 2^315821242 is an apocalyptic number.

315821242 is a deficient number, since it is larger than the sum of its proper divisors (219241286).

315821242 is a wasteful number, since it uses less digits than its factorization.

315821242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its digits is 3840, while the sum is 28.

The square root of 315821242 is about 17771.3601617884. The cubic root of 315821242 is about 681.0000007188. Note that the first 6 decimals are identical.

Adding to 315821242 its reverse (242128513), we get a palindrome (557949755).

The spelling of 315821242 in words is "three hundred fifteen million, eight hundred twenty-one thousand, two hundred forty-two".