315212191 has 4 divisors (see below), whose sum is σ = 360242512. Its totient is φ = 270181872.

The previous prime is 315212173. The next prime is 315212201. The reversal of 315212191 is 191212513.

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 315212191 - 2⁵ = 315212159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315212111) 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, 22515150 + ... + 22515163.

It is an arithmetic number, because the mean of its divisors is an integer number (90060628).

Almost surely, 2^315212191 is an apocalyptic number.

315212191 is a deficient number, since it is larger than the sum of its proper divisors (45030321).

315212191 is an equidigital number, since it uses as much as digits as its factorization.

315212191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45030320.

The product of its digits is 540, while the sum is 25.

The square root of 315212191 is about 17754.2161471578. The cubic root of 315212191 is about 680.5619568913.

The spelling of 315212191 in words is "three hundred fifteen million, two hundred twelve thousand, one hundred ninety-one".