315421243 has 4 divisors (see below), whose sum is σ = 315556648. Its totient is φ = 315285840.

The previous prime is 315421237. The next prime is 315421273. The reversal of 315421243 is 342124513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 315421243 - 2²⁵ = 281866811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315421273) 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, 64146 + ... + 68887.

It is an arithmetic number, because the mean of its divisors is an integer number (78889162).

Almost surely, 2^315421243 is an apocalyptic number.

315421243 is a deficient number, since it is larger than the sum of its proper divisors (135405).

315421243 is a wasteful number, since it uses less digits than its factorization.

315421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135404.

The product of its digits is 2880, while the sum is 25.

The square root of 315421243 is about 17760.1025616408. The cubic root of 315421243 is about 680.7123755633.

Adding to 315421243 its reverse (342124513), we get a palindrome (657545756).

The spelling of 315421243 in words is "three hundred fifteen million, four hundred twenty-one thousand, two hundred forty-three".