315073821 has 4 divisors (see below), whose sum is σ = 420098432. Its totient is φ = 210049212.

The previous prime is 315073819. The next prime is 315073823. The reversal of 315073821 is 128370513.

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 an interprime number because it is at equal distance from previous prime (315073819) and next prime (315073823).

It is not a de Polignac number, because 315073821 - 2¹ = 315073819 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 (315073823) 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, 52512301 + ... + 52512306.

It is an arithmetic number, because the mean of its divisors is an integer number (105024608).

Almost surely, 2^315073821 is an apocalyptic number.

It is an amenable number.

315073821 is a deficient number, since it is larger than the sum of its proper divisors (105024611).

315073821 is a wasteful number, since it uses less digits than its factorization.

315073821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105024610.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 315073821 is about 17750.3188985438. The cubic root of 315073821 is about 680.4623592834.

The spelling of 315073821 in words is "three hundred fifteen million, seventy-three thousand, eight hundred twenty-one".