313440247 has 2 divisors, whose sum is σ = 313440248. Its totient is φ = 313440246.

The previous prime is 313440217. The next prime is 313440263. The reversal of 313440247 is 742044313.

It is a strong prime.

It is an emirp because it is prime and its reverse (742044313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313440247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313440217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156720123 + 156720124.

It is an arithmetic number, because the mean of its divisors is an integer number (156720124).

Almost surely, 2^313440247 is an apocalyptic number.

313440247 is a deficient number, since it is larger than the sum of its proper divisors (1).

313440247 is an equidigital number, since it uses as much as digits as its factorization.

313440247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 313440247 is about 17704.2437567946. The cubic root of 313440247 is about 679.2843155059.

The spelling of 313440247 in words is "three hundred thirteen million, four hundred forty thousand, two hundred forty-seven".