315221073 has 4 divisors (see below), whose sum is σ = 420294768. Its totient is φ = 210147380.

The previous prime is 315221069. The next prime is 315221117. The reversal of 315221073 is 370122513.

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.

It is a cyclic number.

It is not a de Polignac number, because 315221073 - 2² = 315221069 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (315221063) 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, 52536843 + ... + 52536848.

It is an arithmetic number, because the mean of its divisors is an integer number (105073692).

Almost surely, 2^315221073 is an apocalyptic number.

It is an amenable number.

315221073 is a deficient number, since it is larger than the sum of its proper divisors (105073695).

315221073 is a wasteful number, since it uses less digits than its factorization.

315221073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105073694.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 315221073 is about 17754.4662831638. The cubic root of 315221073 is about 680.5683490875.

Adding to 315221073 its reverse (370122513), we get a palindrome (685343586).

The spelling of 315221073 in words is "three hundred fifteen million, two hundred twenty-one thousand, seventy-three".