313221187 has 2 divisors, whose sum is σ = 313221188. Its totient is φ = 313221186.

The previous prime is 313221157. The next prime is 313221191. The reversal of 313221187 is 781122313.

It is a strong prime.

It is an emirp because it is prime and its reverse (781122313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313221187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313221127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156610593 + 156610594.

It is an arithmetic number, because the mean of its divisors is an integer number (156610594).

Almost surely, 2^313221187 is an apocalyptic number.

313221187 is a deficient number, since it is larger than the sum of its proper divisors (1).

313221187 is an equidigital number, since it uses as much as digits as its factorization.

313221187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 313221187 is about 17698.0560231908. The cubic root of 313221187 is about 679.1260304709.

The spelling of 313221187 in words is "three hundred thirteen million, two hundred twenty-one thousand, one hundred eighty-seven".