247313251 has 2 divisors, whose sum is σ = 247313252. Its totient is φ = 247313250.

The previous prime is 247313249. The next prime is 247313279. The reversal of 247313251 is 152313742.

It is an a-pointer prime, because the next prime (247313279) can be obtained adding 247313251 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247313251 - 2¹ = 247313249 is a prime.

It is a super-2 number, since 2×247313251² = 122327688240378002, which contains 22 as substring.

Together with 247313249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (247313221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123656625 + 123656626.

It is an arithmetic number, because the mean of its divisors is an integer number (123656626).

Almost surely, 2^247313251 is an apocalyptic number.

247313251 is a deficient number, since it is larger than the sum of its proper divisors (1).

247313251 is an equidigital number, since it uses as much as digits as its factorization.

247313251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 247313251 is about 15726.1963296914. The cubic root of 247313251 is about 627.6956642356.

Adding to 247313251 its reverse (152313742), we get a palindrome (399626993).

The spelling of 247313251 in words is "two hundred forty-seven million, three hundred thirteen thousand, two hundred fifty-one".